Physics Exam Concept Question
An object is undergoing free fall motion. As it falls, the object's ____. a. speed increases b. acceleration increases c. both of these d. none of these
A
Multiple Choice: As an object freely falls, its __________. A. speed increases B. acceleration increases C. Both of these D. None of these
A
Multiple Choice: If an object is moving eastward and slowing down, then the direction of its velocity vector is _________. A. eastward B. westward C. neither D. not enough info to tell
A
Multiple Choice: What is the acceleration of a car that maintains a constant velocity of 55 mi/hr for 10.0 seconds? A. 0 B. 5.5 m/h/s C. 5.5 m/s/s D. 550 m/h/s
A
Multiple Choice: Which one of the following statements is NOT true of a free-falling object? An object in a state of free fall ____. A. falls with a constant speed of -10 m/s B. falls with an acceleration of -10 m/s/s C. falls under the sole influence of gravity D. falls with downward acceleration which has a constant magnitude
A
Suppose that you're driving down the highway and a moth crashes into the windshield of your car. Which undergoes the *greater acceleration*? a. the moth b. your car c. both the same
A
The amount of net force required to keep a 5-kg object moving rightward with a constant velocity of 2 m/s is ____. a. 0 N b. 0.4 N c. 2 N d. 2.5 N e. 5 N
A
If mass and collision time are equal, then impulses are greater on objects which rebound (or bounce). a. TRUE b. FALSE
A True
A relatively large force acting for a relatively long amount of time on a relatively small mass will produce a relatively ______. List all that apply. a. small velocity change b. large velocity change c. small momentum change d. small acceleration
B
A wad of chewed bubble gum is moving with 1 unit of momentum when it collides with a heavy box that is initially at rest. The gum sticks to the box and both are set in motion with a combined momentum that is ___. a. less than 1 unit b. 1 unit c. more than 1 unit d. not enough information
B
An object rests upon an inclined plane. If the angle of incline is increased, then the normal force would _______ . a. increase b. decrease c. remain the same
B
Multiple Choice: A speedometer is placed upon a free-falling object in order to measure its instantaneous speed during the course of its fall. Its speed reading (neglecting air resistance) would increase each second by ____. A. about 5 m/s B. about 10 m/s C. about 15 m/s D. A variable amount E. Depends on its initial speed
B
Multiple Choice: Consider drops of water that leak from a dripping faucet at a constant rate. As the drops fall they _________. A. get closer together B. get farther apart C. remain at a relatively fixed distance from one another
B
Multiple Choice: If an object is moving eastward and slowing down, then the direction of its acceleration vector is ________. A. eastward B. westward C. neither D. not enough info to tell
B
Multiple Choice: The average speed of an object which moves 10 kilometers (km) in 30 minutes is ____. A. 10 km/hr B. 20 km/hr C. 30 km/hr D. more than 30 km/hr
B
Multiple Choice: When a rock is dropped, it will accelerate downward at a rate of 9.8 m/s2. If the same rock is thrown downward (instead of being dropped from rest), it acceleration will be ____. (Ignore air resistance effects.) A. less than 9.8 m/s^2 B. 9.8 m/s^2 C. more than 9.8 m/s^2
B
Multiple Choice: Which one of the following quantities is NOT a speed? A 10 mph B. 10 m/h/s C. 35 m/s D. 20 m/s
B
Roll a bowling ball off the edge of a table. As it falls, its horizontal component of velocity ___. a. decreases b. remains constant c. increases
B
When adding vector B to vector A geometrically (or graphically) using the head to tail method, the resultant is drawn from ____ to the ____. a. head of A, tail of B b. tail of A, head of B c. head of B, tail of A d. tail of B, head of A
B
TRUE or FALSE: The order in which vectors is added will effect the end result. a. True b. False
B. False
A physics cart rolls along a low-friction track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is ____. a. zero b. four times as large c. twice as large d. unchanged
C
A truck driving along a highway road has a large quantity of momentum. If it moves at the same speed but has twice as much mass, its momentum is ________________. a. zero b. quadrupled c. doubled d. unchanged
C
At what point in its path is the vertical component of the velocity (vy) of a projectile the smallest? a. The instant it is thrown. b. Halfway to the top. c. At the top. d. As it nears the top. e. It is the same throughout the path.
C
Consider the concepts of work and energy (presuming you have already studied it) and those of impulse and momentum. Force and time is related to momentum change in the same manner as force and displacement pertains to ___________. a. impulse b. work c. energy change d. velocity e. none of these.
C
In order to catch a ball, a baseball player naturally moves his or her hand backward in the direction of the ball's motion once the ball contacts the hand. This habit causes the force of impact on the players hand to be reduced in size principally because ___. A. the resulting impact velocity is lessened B. the momentum change is decreased C. the time of impact is increased D. the time of impact is decreased E. none of these
C
Multiple Choice: A baseball pitcher delivers a fast ball. During the throw, the speed of the ball increases from 0 to 30.0 m/s over a time of 0.100 seconds. The average acceleration of the baseball is ____ m/s2. A. 3.00 B. 30.00 C. 3000 D. none of these
C
Multiple Choice: A fullback is running down the football field in a straight line. He starts at the 0-yard line at 0 seconds. At 1 second, he is on the 10-yard line; at 2 seconds, he is on the 20-yard line; at 3 seconds, he is on the 30-yard line; and at 4 seconds, he is on the 40-yard line. This is evidence that A. he is accelerating B he is covering a greater distance in each consecutive second C. he is moving with a constant speed (on average).
C
Multiple Choice: If an object has an acceleration of 0 m/s^2, then one can be sure that the object is not _______. A. Moving B. Changing position C. Changing velocity
C
Multiple Choice: On takeoff, a rocket accelerates from rest at a rate of 50.0 m/s2 for exactly 1 minute. The rocket's speed after this minute of steady acceleration will be ____ m/s. A. 50.0 B. 500 C. 3.00 x 10^3 D. 3.60 x 10^3 E. none of these
C
Multiple Choice: Ten seconds after being dropped from rest, a free-falling object will be moving with a speed of ___________. A. about 10 m/s B. about 50 m/s C. about 100 m/s D. more than 100 m/s
C
Multiple Choice: Which one of the following is NOT consistent with a car which is accelerating? A. A car is moving with an increasing speed B. A car is moving with a decreasing speed C. A car is moving with a high speed D. A car is changing direction
C
Suppose that you're driving down the highway and a moth crashes into the windshield of your car. Which undergoes the *greater change is momentum*? a. the moth b. your car c. both the same
C
Suppose that you're driving down the highway and a moth crashes into the windshield of your car. Which undergoes the *greater force*? a. the moth b. your car c. both the same
C
Suppose that you're driving down the highway and a moth crashes into the windshield of your car. Which undergoes the *greater impulse*? a. the moth b. your car c. both the same
C
The firing of a bullet by a rifle causes the rifle to recoil backwards. The speed of the rifle's recoil is smaller than the bullet's forward speed because the ___. a. force against the rifle is relatively small b. speed is mainly concentrated in the bullet c. rifle has lots of mass d. momentum of the rifle is unchanged e. none of these
C
The vector sum (magnitude only) of 25.0 m, north + 18.0 m, East is ___ m. a. 7.00 b. 21.5 c. 30.8 d. 35.8 e. 43.0 f. 54.2 g. 949 h. None of these
C
Three vectors are added following the rules of vector addition. A fourth vector is drawn from the tail of the first vector to the head of the last vector. This fourth vector is referred to as ____. a. the equilibrant b. the hypotenuse c. the resultant d. a mistake
C
Two objects, A and B, have the same size and shape. Object A is twice as massive as B. The objects are simultaneously dropped from a high window on a tall building. (Neglect the effect air resistance.) The objects will reach the ground at the same time but object A will have a greater ___. Choose all that apply. a. speed b. acceleration c. momentum d. none of the above quantities will be greater
C
According to Newton's third law, every force is accompanied by an equal and opposite reaction force. The reason that these forces do not cancel each other is ____. a. the action force acts for a longer time period b. the two forces are not always in the same direction c. one of the two forces is greater than the other d. the two forces act upon different objects; only forces on the same object can balance each other. e. ... nonsense! They do cancel each other. Objects accelerate because of the presence of a third force.
D
Consider a karate expert. During a talent show, she executes a swift blow to a cement block and breaks it with her bare hand. During the collision between her hand and the block, the ___. A. time of impact on both the block and the expert's hand is the same B. force on both the block and the expert's hand have the same magnitude C. impulse on both the block and the expert's hand have the same magnitude D. all of the above. E. none of the above.
D
If two displacement vectors of 6 meters and 8 meters (with varying directions) are added together, then the resultant could range anywhere between ___ meters and ___ meters. a. 0, 48 b. 1.33, 48 c. 0, 14 d. 2, 14 e. ... nonsense! No such prediction can be made. f. ... nonsense! A prediction can be made but none of these choices are correct.
D
It is NOT possible for a rocket to accelerate in outer space because ____. List all that apply. A. there is no air in space B. there is no friction in space C. there is no gravity in outer space D. ... nonsense! Rockets do accelerate in outer space.
D
Multiple Choice: If car A passes car B, then car A must be ___________. A. accelerating B. accelerating at a greater rate than car B C. moving faster than car B and accelerating more than car B D. moving faster than car B, but not necessarily accelerating
D
Multiple Choice: Which one of the following quantities is NOT a vector? A. 10 mile/hour east B. 10 mile/hour/sec west C. 35 m/s north D. 20 m/s
D
Suppose that Paul D. Trigger fires a bullet from a gun. The speed of the bullet leaving the muzzle will be the same as the speed of the recoiling gun ____. A. because momentum is conserved B. because velocity is conserved C. because both velocity and momentum are conserved D. only if the mass of the bullet equals the mass of the gun E. none of these
D
The vector sum (magnitude only) of 32.0 m, north + 41.0 m, west is ___ m. a. 9.00 b. 36.5 c. 38.0 d. 52.0 e. 73.0 f. 128 g. 2.70 x 10^3 h. None of these
D
As you sit in your chair and study your physics (presuming that you do), the force of gravity acts downward upon your body. The reaction force to the force of the Earth pulling you downward is ___. a. the force of the chair pushing you upward b. the force of the floor pushing your chair upward c. the force of the Earth pushing you upward d. the force of air molecules pushing you upwards e. the force of your body pulling the Earth upwards f. ... nonsense! Gravity is a field force and there is no such reaction force.
E
At what point in its path is the horizontal component of the velocity (vx) of a projectile the smallest? a. The instant it is thrown. b. Halfway to the top. c. At the top. d. As it nears the top. e. It is the same throughout the path.
E
TRUE or FALSE: A ball is dropped from the same height upon various flat surfaces. For the same collision time, impulses are smaller when the most bouncing take place. a. True b. False
False
TRUE or FALSE: An object which is moving rightward has a rightward force acting upon it.
False
TRUE or FALSE: For an object resting upon a non-accelerating surface, the normal force is equal to the force of gravity.
False
True of False: An object which is moving rightward has a rightward force acting upon it
False
True or False: For an object resting upon a non-accelerating surface, the normal force is equal to the weight of the object.
False
A golf pro places a ball at rest on the tee, lines up his shot, draws back his club, and lets one rip. During the contact of the golf club with the golf ball, the force of the club on the ball is ____ the force of the ball on the club and the acceleration of the club is ____ than the acceleration of the ball. a. greater than, greater than b. greater than, equal to c. greater than, less than d. less than, less than e. less than, equal to f. less than, greater than g. equal to, equal to h. equal to, greater than i. equal to, less than
I
Numerical values and directions are stated for a variety of quantities. Which of these statements represent a vector description? Include all that apply. A. 20 meters, west B. 9.8 m/s/s C. 35 mi/hr, south D. 16 years old
o A o C
Which of the following statements are true of vector addition, vector subtraction, and vector addition diagrams? List all that apply. A. Vectors A, B, and C are added together as A + B + C. If the order in which they are added is changed to C + B + A, then the result would be different. B. Vectors A, B, and C are added together as A + B + C. If the order in which they are added is reversed to C + B + A, then the result would be a vector with the same magnitude but the opposite direction. C. When constructing a vector diagram for A + B + C, it is not absolutely necessary that vectors B and C use the same scale that is used by vector A. D. The resultant in a vector addition diagram always extends from the head of the last vector to the tail of the first vector.
none of these are right
Which of the following statements are true of an object that experiences balanced forces (or unbalanced forces)? List all that apply. A. If a person is moving to the right, then the forces acting upon it are NOT balanced. B. A balance of forces is demonstrated by an object which is slowing to a stop. C. It would take an unbalanced force to keep an object in motion. D. If an object is moving with a constant speed in a circle, then the forces acting upon the object are balanced.
none of these are true
Which of the following statements are true of an object that experiences balanced forces (or unbalanced forces)? List all that apply. E. If an object is accelerating at a constant rate of acceleration, then the forces acting upon the object are balanced. F. It is NOT possible for just three forces to be acting upon an object and they still balance each other. G. A free-falling object experiences a balance of forces. H. Balanced forces cause stationary objects to remain at rest and moving objects to come to rest. I. Unbalanced forces cause objects to move.
none of these are true
Consider Newton's first law of motion to determine which of the following statements are true? List all that apply. A. Newton's first law of motion is applicable to both moving and nonmoving objects. B. If a football is moving upwards and rightwards towards the peak of its trajectory, then there are both rightwards and upwards forces acting upon it. C. It would take an unbalanced force to keep an object in motion. D. If an object is at rest, then there are no forces acting upon the object. E. It would take an unbalanced force to keep an object in motion at a constant velocity.
o A
Which of the following statements about vectors and scalars are TRUE? List all that apply. A. Scalar quantities are path dependent quantities and vector quantities are not. B. The quantity 20 m/s, north is a speed and as such is a scalar quantity. C. The quantity 9.8 m/s/s is an acceleration value and as such is a vector quantity.
o A
Which of the following statements are true about elastic and inelastic collisions? A. Perfectly elastic and perfectly inelastic collisions are the two opposite extremes along a continuum; where a particular collision lies along the continuum is dependent upon the amount kinetic energy which is conserved by the two objects. B. Most collisions tend to be partially to completely elastic. C. Momentum is conserved in an elastic collision but not in an inelastic collision.
o A
Which of the following statements are true of the concept of force? List all that apply. *A.* A force is a push or pull exerted upon an object which results from the interaction of that object with its environment. *B.* Bubba approaches Billie and gives him a swift shove. Timid little Billie keeps his hands in his pocket during this interaction. Subsequently, while Bubba places a force upon Billie, Billie does not place a force upon Bubba. *C.* A quarterback throws a football down field. Once thrown, the force from the quarterback persists upon the ball to cause it to continue on its upward trajectory towards its peak. *D.* A sled slides down the hill and reaches the bottom where it gradually slows to a stop. Once on the level ground, the force of the hill persists upon the sled to allow it to continue its forward motion. *E.* Forces always cause objects to move.
o A
Consider Newton's second law of motion to determine which of the following statements are true? List all that apply. *A*. If an object is accelerating to the right, the net force on the object must be directed towards the right. *B.* If an object is moving to the right and slowing down, then the net force on the object is directed towards the left. *C*. Accelerating objects are either slowing down or speeding up. *D*. The acceleration of an object is directly dependent upon its mass and inversely dependent upon its net force. *E*. An object has an acceleration of 8 m/s/s. If the net force acting upon the object is increased by a factor of 2, then the new acceleration would be 10 m/s/s.
o A o B
Which of the following statements about velocity time graphs are TRUE? List all that apply. A. the slope on a velocity-time graph is representative of the acceleration of the object B. The area on a velocity time graph is representative of the change in position of the object. C. An accelerated object's motion will be represented by a curved line on a velocity-time graph. D. Objects with positive acceleration will be represented by upwardly-curved lines on a velocity-time graph.
o A o B
Which of the following statements are true about collisions? A. Two colliding objects will exert equal forces upon each other even if their mass is significantly different. B. During a collision, an object always encounters an impulse and a change in momentum. C. During a collision, the impulse which an object experiences is equal to its velocity change.
o A o B
Which of the following statements are true of the quantity weight? List all that apply. A. The weight of an object is dependent upon the value of the acceleration of gravity. B. Weight refers to a force experienced by an object. C. The weight of an object would be less on the Moon than on the Earth. D. A person could reduce their weight significantly by taking an airplane ride to the top of Mount Everest.
o A o B o C
Which of the following statements are true of projectiles? List all that apply. A. A projectile is a free-falling object. B. A projectile experiences negligible or no air resistance. C. A projectile must be moving in the downward direction. D. A projectile must be accelerating in the downward direction.
o A o B o D
Cars are equipped with padded dashboards. In collisions, the padded dashboards would be safer than non-padded ones because they ____. List all that apply. a. increase the impact time b. decrease an occupant's impulse c. decrease the impact force d. none of the above
o A o C
Which of the following statements about acceleration are TRUE? List all that apply. A. Acceleration is a vector quantity. B. Accelerating objects MUST be changing their speed. C. Accelerating objects MUST be changing their velocity. D. Acceleration units include the following; m/s^2, mi/hr/sec, cm/s^2, km/hr/m.
o A o C
Which of the following objects have momentum? Include all that apply. a. An electron is orbiting the nucleus of an atom. b. A UPS truck is stopped in front of the school building. c. A Yugo (a compact car) is moving with a constant speed. d. A small flea walking with constant speed across Fido's back. e. The high school building rests in the middle of town.
o A o C o D
Which of the following are never true of an object that is at equilibrium? Include all that apply. A. The object is accelerating. B. The object is at rest. C. The object is moving in a circle at constant speed. D. All the forces acting upon the object are equal. E. The object is in free-fall.
o A o C o E
Which of the following statements about free fall and the acceleration of gravity are TRUE? List all that apply. A. An object that is free-falling is acted upon by the force of gravity alone. B. A falling skydiver which has reached terminal velocity is considered to be in a state of free fall. C. A ball is thrown upwards and is rising towards its peak. As it rises upwards, it is NOT considered to be in a state of free fall. D. An object in free fall experiences an acceleration which is independent of the mass of the object.
o A o D
Which of the following statements are true about momentum? A. Momentum is a vector quantity. B. The standard unit on momentum is the Joule. C. An object with mass will have momentum. D. An object which is moving at a constant speed has momentum. E. An object can be traveling eastward and slowing down; its momentum is westward.
o A o D
Which of the following statements are true of scalars and vectors? List all that are TRUE. A. A vector quantity always has a direction associated with it. B. A scalar quantity can have a direction associated with it. C. Vectors can be added together; scalar quantities cannot. D. Vectors can be represented by an arrow on a scaled diagram; the length of the arrow represents the vector's magnitude and the direction it points represents the vector's direction.
o A o D
Which of the following statements about velocity and/or speed are TRUE? List all that apply. A. Velocity is a vector quantity and speed is a scalar quantity. B. Both speed and velocity refer to how fast an object is moving. C. Person X moves from location A to location B in 5 seconds. Person Y moves between the same two locations in 10 seconds. Person Y is moving with twice the speed as person X. D. The velocity of an object refers to the rate at which the object's position changes. E. For any given motion, it is possible that an object could move very fast yet have an abnormally small velocity.
o A o D o E
Which of the following statements about distance and/or displacement are TRUE? List all that apply. A. The phrase "20 mi, northwest" likely describes the distance for a motion. B. The phrase "20 m, west" likely describes the displacement for a motion.
o B
Which of the following statements about velocity and/or speed are TRUE? List all that apply. A. The phrase "30 mi/hr, west" likely refers to a scalar quantity. B. The average velocity of an object on a round-trip journey would be 0. C. The direction of the velocity vector is dependent upon two factors: the direction the object is moving and whether the object is speeding up or slowing down.
o B
Which of the following statements are true of the quantity mass? List all that apply. A. The mass of an object is dependent upon the value of the acceleration of gravity. B. The standard metric unit of mass is the kilogram. C. Mass depends on how much stuff is present in an object. D. The mass of an object is variable and dependent upon its location. E. An object would have more mass on Mount Everest than the same object in the middle of Lake Michigan.
o B o C
Which of the following statements are true of the time of flight for a projectile? List all that apply. A. The time that a projectile is in the air is dependent upon the horizontal component of the initial velocity. B. The time that a projectile is in the air is dependent upon the vertical component of the initial velocity. C. For a projectile which lands at the same height that it is projected from, the time to rise to the peak is equal to the time to fall from its peak to the original height.
o B o C
Which of the following statements about distance and/or displacement are TRUE? List all that apply. A. Distance is a vector quantity and displacement is a scalar quantity B. A person makes a round-trip journey, finishing where she started. The displacement for the trip is 0 and the distance is some nonzero value. C. A person starts at position A and finishes at position B. The distance for the trip is the length of the segment measured from A to B. D. If a person walks in a straight line and never changes direction, then the distance and the displacement will have exactly the same magnitude.
o B o D
Which of the following statements are true about impulse? A. Impulse is a force. B. Impulse is a vector quantity. C. An object which is traveling east would experience a westward directed impulse in a collision. D. Objects involved in collisions encounter impulses. E. The Newton is the unit for impulse.
o B o D
Which of the following quantities are vectors? Include all that apply. A. distance traveled B. displacement C. average speed D. average velocity E. instantaneous velocity F. acceleration
o B o D o E o F
Which of the following are true about the relationship between momentum end energy? A. Momentum is a form of energy. B. If an object has momentum, then it must also have mechanical energy. C. If an object does not have momentum, then it definitely does not have mechanical energy either. D. Object A has more momentum than object B. Therefore, object A will also have more kinetic energy. E. Two objects of varying mass have the same momentum. The least massive of the two objects will have the greatest kinetic energy.
o B o E
Which of the following statements about vectors and scalars are TRUE? List all that apply. A. A vector is a large quantity and a scalar is a small quantity. B. A scalar quantity has a magnitude and a vector quantity does not. C. A vector quantity is described with a direction and a scalar is not. D. A scalar quantity depends only upon the initial and final values of the quantity; this is not the case for vector quantities.
o C
Which of the following statements are true of the vertical motion of projectiles? List all that apply. A. The vertical component of a projectile's velocity is a constant value of 9.8 m/s. B. The vertical component of a projectile's velocity is constant. C. The vertical component of a projectile's velocity is changing. D. The vertical component of a projectile's velocity is changing at a constant rate.
o C o D
Which of the following statements about position-time graphs are TRUE? List all that apply. A. Position-time graphs cannot be used to represent the motion of objects with accelerated motion. B. The slope on a position-time graph is representative of the acceleration of the object. C. A straight, diagonal line on a position-time graph is representative of an object with a constant velocity. D. If an object is at rest, then the position-time graph will be a horizontal line located on the time-axis. E. Accelerated objects are represented on position-time graphs by curved lines.
o C o E
Which of the following are always true of an object that is at equilibrium? Include all that apply. A. All the forces acting upon the object are equal. B. The object is at rest. C. The object is moving and moving with a constant velocity. D. The object has an acceleration of zero.
o D
Which of the following descriptions of moving objects accurately portray a projectile? List all that apply. A. an object which is moving through the air and not touching any surface B. a falling skydiver with an open parachute C. any object upon which air resistance is negligible D. a free-falling object
o D
Which of the following statements are true of inertia? List all that apply. A. Inertia is a force. B. Inertia is a force which keeps stationary objects at rest and moving objects in motion at constant velocity. C. Inertia is a force which brings all objects to a rest position. D. All objects have inertia.
o D
Which of the following statements are true of the horizontal motion of projectiles? List all that apply. A. A projectile does not have a horizontal velocity. B. A projectile with a rightward component of motion will have a rightward component of acceleration. C. The horizontal velocity of a projectile changes by 9.8 m/s each second. D. A projectile with a horizontal component of motion will have a constant horizontal velocity.
o D
Which of the following statements are true of the time of flight for a projectile? List all that apply. D. For the same upward launch angles, projectiles will stay in the air longer if the initial velocity is increased. E. Assume that a kicked ball in football is a projectile. If the ball takes 3 seconds to rise to the peak of its trajectory, then it will take 6 seconds to fall from the peak of its trajectory to the ground.
o D
Consider the head-on collision between a lady bug and the windshield of a high speed bus. Which of the following statements are true? List all that apply. *A.* The magnitude of the force encountered by the bug is greater than that of the bus. *B.* The magnitude of the impulse encountered by the bug is greater than that of the bus. *C.* The magnitude of the momentum change encountered by the bug is greater than that of the bus. *D.* The magnitude of the velocity change encountered by the bug is greater than that of the bus. *E*. The magnitude of the acceleration encountered by the bug is greater than that of the bus.
o D o E
Which of the following statements about velocity time graphs are TRUE? List all that apply. E. If an object is at rest, then the velocity-time graph will be a line with zero slope. F. A line with zero slope on a velocity-time graph will be representative of an object which is at rest. G. A line with a negative slope on a velocity-time graph is representative of an object with negative velocity. H. If an object changes its direction, then the line on the velocity-time graph will have a changing slope. I. An object which is slowing down is represented by a line on a velocity-time graph which is moving in the downward direction.
o E
Which of the following statements are true of inertia? List all that apply. E. A more massive object has more inertia than a less massive object. F. Fast-moving objects have more inertia than slow-moving objects. G. An object would not have any inertia in a gravity-free environment (if there is such a place). H. Inertia is the tendency of all objects to resist motion and ultimately stop. I. In a gravity-free environment (should there be one), a person with a lot of inertia would have the same ability to make a turn as a person with a small amount of inertia.
o E
Which of the following statements are true about elastic and inelastic collisions? D. The kinetic energy of an object remains constant during an elastic collision. E. Elastic collisions occur when the collision force is a non-contact force. F. Most collisions are not inelastic because the collision forces cause energy of motion to be transformed into sound, light and thermal energy (to name a few).
o E o F
Which of the following statements are true of vector addition, vector subtraction, and vector addition diagrams? List all that apply. E. If vectors A and B are added at right angles to each other, then one can be sure that the resultant will have a magnitude that is greater than the magnitudes of either one of the individual vectors A and B. F. If vectors A and B are added at right angles to each other, then one can be sure that the resultant will have a magnitude that is less than the arithmetic sum of the magnitudes of A and B. G. Vector addition diagrams cannot be used to determine the resultant when there is a vector subtraction operation.
o E o F
Which of the following are always true of an object that is at equilibrium? Include all that apply. E. There is no change in the object's velocity. F. The sum of all the forces is 0 N. G. All the forces acting upon an object are balanced.
o E o F o G
Which of the following statements are true of projectiles? List all that apply. E. A projectile does not have to have horizontal motion. F. A projectile could begin its projectile motion with a downward velocity. G. A projectile does not need to be "falling."
o E o F o G
Which of the following statements about acceleration are TRUE? List all that apply. E. The direction of the acceleration vector is dependent upon two factors: the direction the object is moving and whether the object is speeding up or slowing down. F. An object which is slowing down has an acceleration. G. An object which is moving at constant speed in a circle has an acceleration. H. Acceleration is the rate at which the velocity changes. I. An object that is accelerating is moving fast.
o E o F o G o H
Which of the following statements are true of the quantity weight? List all that apply. E. Two objects of the same mass can weigh differently. F. To gain weight, one must put on more mass. G. The weight of an object can be measured in kilograms. H. The weight of an object is equal to the force of gravity acting upon the object. I. When a chemistry student places a beaker on a balance and determines it to be 84.3 grams, they have weighed the beaker.
o E o F o H
Which of the following descriptions of moving objects accurately portray a projectile? List all that apply. E. an object upon which the only significant force is the force of gravity F. a falling feather G. a falling feather in a vacuum chamber H. a falling feather in a falling vacuum chamber.
o E o G o H
Which of the following statements are true about collisions? D. The velocity change of two respective objects involved in a collision will always be equal. E. While individual objects may change their velocity during a collision, the overall or total velocity of the colliding objects is conserved. F. In a collision, the two colliding objects could have different acceleration values.
o F
Numerical values and directions are stated for a variety of quantities. Which of these statements represent a vector description? Include all that apply. E. 60 minutes F. 3.5 m/s/s, south G. -3.5 m/s/s H. +20 degrees C
o F o G
Which of the following statements about position-time graphs are TRUE? List all that apply. F. An object with a positive velocity will be represented on a position-time graph by a line with a positive slope. G. An object with a negative velocity will be represented on a position-time graph by a line with a negative slope. H. An object with a positive acceleration will be represented on a position-time graph by a line which curves upwards. I. An object with a negative acceleration will be represented on a position-time graph by a line which curves downwards.
o F o G
Which of the following statements about free fall and the acceleration of gravity are TRUE? List all that apply. E. A ball is thrown upwards, rises to its peak and eventually falls back to the original height. As the ball rises, its acceleration is upwards; as it falls, its acceleration is downwards. F. A ball is thrown upwards, rises to its peak and eventually falls back to the original height. The speed at which it is launched equals the speed at which it lands. (Assume negligible air resistance.) G. A very massive object will free fall at the same rate of acceleration as a less massive object. H. The value of g on Earth is approximately 9.8 m/s2. I. The symbol g stands for the force of gravity.
o F o G o H
Which of the following statements are true of the horizontal motion of projectiles? List all that apply. E. The horizontal velocity of a projectile is 0 m/s at the peak of its trajectory. F. The horizontal velocity of a projectile is unaffected by the vertical velocity; these two components of motion are independent of each other. G. The horizontal displacement of a projectile is dependent upon the time of flight and the initial horizontal velocity. H. The final horizontal velocity of a projectile is always equal to the initial horizontal velocity.
o F o G o H
Which of the following statements are true of the vertical motion of projectiles? List all that apply. E. A projectile with an upward component of motion will have a upward component of acceleration. F. A projectile with an downward component of motion will have a downward component of acceleration. G. The magnitude of the vertical velocity of a projectile changes by 9.8 m/s each second. H. The vertical velocity of a projectile is 0 m/s at the peak of its trajectory.
o F o G o H
Which of the following statements are true about impulse? F. The kg•m/s is equivalent to the units on impulse. G. An object which experiences a net impulse will definitely experience a momentum change. H. In a collision, the net impulse experienced by an object is equal to its momentum change. I. A force of 100 N acting for 0.1 seconds would provide an equivalent impulse as a force of 5 N acting for 2.0 seconds.
o F o G o H o I
Which of the following statements are true of the concept of force? List all that apply. F. An object can experience two or more forces and not accelerate. G. A contact force results from the physical contact between two objects. H. A field force results from the action of two objects which are positioned some distance away. I. Spring and tension forces are examples of field forces. J. A force is a vector quantity; there is always a direction associated with it. K. Force can be measured in kilograms or Newtons depending upon the system of measurement (metric or otherwise).
o F o G o J o H
Which of the following statements are true of the quantity mass? List all that apply. F. People in Weight Watcher's are really concerned about their mass (they're mass watchers). G. The mass of an object can be measured in pounds. H. If all other variables are equal, then an object with a greater mass would have a more difficult time accelerating. I. If all other variables are equal, then it would require less exerted force to stop a less massive object than to stop a more massive object. J. The mass of an object is mathematically related to the weight of the object.
o F o H o I o J
Which of the following are never true of an object that is at equilibrium? Include all that apply. F. The object is falling and has reached its terminal velocity. G. There is a net force acting upon the object. H. The object is moving and moving with a constant velocity. I. The object is at rest.
o G
Which of the following statements are true about momentum? F. Momentum is a conserved quantity; the momentum of an object is never changed. G. The momentum of an object varies directly with the speed of the object. H. Two objects of different mass are moving at the same speed; the more massive object will have the greatest momentum.
o G o H
Which of the following statements are true about elastic and inelastic collisions? G. A ball is dropped from rest and collides with the ground. The higher that the ball rises upon collision with the ground, the more elastic that the collision is. H. A moving air track glider collides with a second stationary glider of identical mass. The first glider loses all of its kinetic energy during the collision as the second glider is set in motion with the same original speed as the first glider. Since the first glider lost all of its kinetic energy, this is a perfectly inelastic collision. I. The collision between a tennis ball and a tennis racket tends to be more elastic in nature than a collision between a halfback and linebacker in football.
o G o I
Consider Newton's second law of motion to determine which of the following statements are true? List all that apply. *F.* An object has an acceleration of 8 m/s/s. If the net force is increased by a factor of 3, then the new acceleration would be 11 m/s/s. *G.* An object has an acceleration of 8 m/s/s. If the mass is increased by a factor of 2, then the new acceleration would be 16 m/s/s. *H*. An object has an acceleration of 8 m/s/s. If the mass is increased by a factor of 4, then the new acceleration would be 2 m/s/s. *I.* An object has an acceleration of 8 m/s/s. If the net force is increased by a factor of 2 and the mass is decreased by a factor of 2, then the two factors would offset each other and the acceleration would still be 8 m/s/s. *J.* An object has an acceleration of 8 m/s/s. If the net force is increased by a factor of 2 and the mass is increased by a factor of 4, then the new acceleration would be 4 m/s/s.
o H o J
Consider Newton's first law of motion to determine which of the following statements are true? List all that apply. F. It is the natural tendency of all objects to eventually come to a rest position. G. A pendulum bob is set into its usual back-and-forth periodic motion. After some time (perhaps 10 minutes), the pendulum bob comes to a rest position. This is best explained by the idea of inertia - all objects eventually resist motion. H. If a 3-kg rock is thrown at a speed of 2 m/s in a gravity-free environment (presuming one could be found), then an unbalanced force of 6 N would be required to keep the rock moving at a constant speed. I. It would take an unbalanced force to cause an object to accelerate from rest.
o I
Which of the following statements are true of the vertical motion of projectiles? List all that apply. I. The vertical velocity of a projectile is unaffected by the horizontal velocity; these two components of motion are independent of each other. J. The final vertical velocity of a projectile is always equal to the initial vertical velocity. K. The vertical acceleration of a projectile is 0 m/s/s when it is at the peak of its trajectory. L. As a projectile rises towards the peak of its trajectory, the vertical acceleration will decrease; as it falls from the peak of its trajectory, its vertical acceleration will decrease.
o I
Which of the following statements about acceleration are TRUE? List all that apply. J. An object that is accelerating will eventually (if given enough time) be moving fast. K. An object that is moving rightward has a rightward acceleration. L. An object that is moving rightward and speeding up has a rightward acceleration. M. An object that is moving upwards and slowing down has an upwards acceleration.
o J o L
Which of the following statements are true about momentum? I. A less massive object can never have more momentum than a more massive object. J. Two identical objects are moving in opposite directions at the same speed. The forward moving object will have the greatest momentum. K. An object with a changing speed will have a changing momentum.
o K
Which of the following statements are true of the horizontal motion of projectiles? List all that apply. *I.* As a projectile rises towards the peak of its trajectory, the horizontal velocity will decrease; as it falls from the peak of its trajectory, its horizontal velocity will decrease. *J.* Consider a projectile launched from ground level at a fixed launch speed and a variable angle and landing at ground level. The horizontal displacement (i.e., the range) of the projectile will always increase as the angle of launch is increased from 0 degrees to 90 degrees. *K.* Consider a projectile launched from ground level at a fixed launch angle and a variable launch speed and landing at ground level. The horizontal displacement (i.e., the range) of the projectile will always increase as the launch speed is increased.
o K
Consider Newton's second law of motion to determine which of the following statements are true? List all that apply. *K*.An object has an acceleration of 8 m/s/s. If the net force acting upon the object is decreased by a factor of 2 and the mass of the object is increased by a factor of 4, then the new acceleration would be 1 m/s/s. *L.* An object has an acceleration of 8 m/s/s. If the net force acting upon the object is increased by a factor of 4 and the mass of the object is increased by a factor of 2, then the new acceleration would be 16 m/s/s. *M*. A 2-kg object accelerates from rest to a final velocity of 6 m/s in 3 seconds. The magnitude of the net force acting upon the object is 12 N. *N*. A 10-kg object slows down from 24 m/s to a final velocity of 9 m/s in 3 seconds. The magnitude of the net force acting upon the object is 80 N.
o K o L
Which of the following statements are true of the vertical motion of projectiles? List all that apply. M. As a projectile rises towards the peak of its trajectory, the vertical acceleration is directed upward; as it falls from the peak of its trajectory, its vertical acceleration is directed downward. N. The peak height to which a projectile rises above the launch location is dependent upon the initial vertical velocity. O. As a projectile rises towards the peak of its trajectory, the vertical velocity will decrease; as it falls from the peak of its trajectory, its vertical velocity will decrease.
o N
Which of the following statements are true of the vertical motion of projectiles? List all that apply. P. Consider a projectile launched from ground level at a fixed launch speed and a variable angle and landing at ground level. The vertical displacement of the projectile during the first half of its trajectory (i.e., the peak height) will always increase as the angle of launch is increased from 0 degrees to 90 degrees. Q. Consider a projectile launched from ground level at a fixed launch angle and a variable launch speed and landing at ground level. The vertical displacement of the projectile during the first half of its trajectory (i.e., the peak height) will always increase as the launch speed is increased.
o P o Q