Physics A Final Exam
The area of contact between two surfaces has no effect on the force of friction. True or False
True
The law of conservation of momentum states that momentum cannot be created or destroyed. True or False
True
The unit for momentum is the kilogram meter per second. True or False
True
The vertical components of tension always add up to the weight of the load being held. True or False
True
Torque depends on where a force is applied. True or False
True
Uniform acceleration and constant acceleration are the same thing. True or False
True
When a horse pulls a cart down the road, the cart pulls back with equal force. True or False
True
You can produce the same torque with a short lever arm and a large force as you can with a long lever arm and a smaller force. True or False
True
If an object is NOT in a state of equilibrium, then ______. a. the object can be at rest b. the object is accelerating c. the net force on the object is zero d. the object can be moving uniformly
B
The point where all the weight of an object appears to be concentrated is called the ________________________ . a. pivot point b. center of gravity c. middle d. lever arm
B
The unit for force is the ________, which is defined as the force required to accelerate a mass of one kilogram one meter per second squared. a. watt b. newton c. joule
B
Which of the following is a vector quantity? a. mass b. velocity c. volume d. distance
B
Which one of these is the rotational equivalent of translational acceleration? a. angular displacement b. Angular acceleration c. rotational inertia d. angular velocity
B
is a force that resists motion. a. Inertia b. Friction c. Weight d. Mass
B
(6.1 x 108)/(2.34 x 10-5) a. 3.8 x 10^-14 b. 3.8 x 10^3 c. 2.6 x 10^13 d. 2.6 x 10^3
C
1 km/hr = ______ m/s a. 2.8 b. 0.10 c. 0.28 d. 3.6
C
A _________ is an object that is launched by some means, and after it is launched, it continues to move because of its own inertia. a. rocket b. missile c. projectile
C
A boat can travel 29.6 m/s in still water. If it travels N on a river that is flowing 99.0m/s W, what is the boat's resultant?</ a. 69.4 m/s, 16.6 deg N of W b. 103 m/s, 16.6 deg W of N c. 103 m/s, 16.6 deg N of W d. 69.4 m/s, 16.6 deg W of N
C
A seesaw is 3.2 m long, with the pivot at the center. A 580 N girl sits at one end. Where would a 670 N boy need to sit to balance the seesaw? a. 0.43 m from the end b. 0.25 m from the end c. 0.21 m from the end.
C
An object with a ____ base and a ____ center of gravity is most stable. a. wide; high b. narrow; high c. wide; low d. narrow; low
C
Find the resultant of the displacements 14 meters East and 11 meters North. a. 18 m b. 18 m, 38o S of W c. 18 m, 38o N of E d. 18 m, 38o E of N
C
For a truck moving at a constant speed .... a. all of these b. the direction traveled during each time period must be the same. c. the distances traveled during each time period are the same. d. the truck must accelerate
C
If you spin a ball attached to a string over your and the string breaks the ball will fly off in a _______ line because a centripetal force would no longer be acting on it. a. parabolic b. downward c. straight d. curved
C
In a perfect machine, work input is ______ work output. a. less than b. greater than c. equal to
C
The center of _________of an object is the point where all the mass of an object seems to be concentrated. a. weight b. momentum c. mass d. inertia
C
The center of gravity of a uniform object, like a board is located _______. a. near the lighter end b. near the heavier end c. at the geometric center d. on either end
C
The graph of total displacement versus total time will be curved, and the slope will change. A steeper slope shows that velocity is __________. a. decreasing b. constant c. increasing
C
What force is used to produce a 35 Nm torque with a 2.5 m lever arm? a. 3.6 N b. 1.4 N c. 14 N d. 7.1 N
C
A horse starts from rest and accelerates at 2.3 m/s2 for 18 seconds. How far does the horse travel? a. 740 m b. 48 m c. 21 m d. 370 m
D
A point at which all the weight of an object appears to be concentrated is called the _____. a. pivot point b. normal c. lever arm d. center of gravity
D
A single vector producing the same effect as two separate vectors acting on the same point is called the _____. a. component b. product c. sum d. resultant
D
A vector is 24 m/s, 17o N of W. The magnitude of the vector is a. 24 b. 10o c. N of W d. 24 m/s
D
_______ is the change in distance over the change in time. a. Gravitation b. Acceleration c. Weight d. Velocity
D
A donut has no center of gravity True or False
False
As the angle of incline increases, the perpendicular component of the weight of an object increases and the parallel component decreases. True or False
False
Circular motion is one-dimensional. True or False
False
Displacement is the total change in the position of the object without regard to direction. True or False
False
Energy cannot be transformed from one form to another. True or False
False
If an external force is exerted on a system, momentum is always conserved. True or False
False
In rotational motion, an object can be treated as a single point. True or False
False
Vectors are drawn using arrow-tipped lines. The length of the line represents the magnitude of the vector. The arrow points in the opposite direction the vector is acting. True or False
False
Velocity has less of an effect on kinetic energy than mass. True or False
False
A single vector producing the same effect as two separate vectors acting on the same point is called the _____. a. resultant b. product c. component d. sum
A
Convert 6200 m/s to km/min. a. 372 b. 6.2 c. 103 d. 372,000
A
According to Newton's 2nd Law, an object's motion changes in the direction of the net force acting on it. True or False
True
An impulse is required to change momentum. True or False
True
An object's center of gravity can be located where no actual material exists. True or False
True
Angular momentum is conserved if there is no net torque. True or False
True
Friction always involves surfaces that are in contact with each other and is caused by the interlocking of irregularities on the two surfaces. True or False
True
Are the zeros in 12.01 m significant? a. yes b. no
A
If a football is kicked so that the force is applied directly to the center of gravity, the ball will ______. a. move through the air without rotating b. tumble end-over-end through the air c. spin about its axis through the air d. move in a counterclockwise spin
A
A useful method of expressing very small or very large numbers is ____ a. decimal notation b. scientific notation c. the metric system d. Roman numerals
B
Since the projectile moves vertically and horizontally at the same time, the trajectory of a projectile is a _________. a. straight line b. parabola c. curve
B
The equation for kinetic energy is KE = ___________ a. ma b. 1/2 mv^2 c. Fd d. mgh
B
How many significant digits are in 1406.870? a. six b. four c. seven d. five
C
As mechanical advantage increases, the efficiency of a machine increases. True or False
False
An object in a state of equilibrium can be at rest or in uniform motion. True or False
True
An object in circular motion is constantly accelerating. True or False
True
Angular momentum = mvr. True or False
True
Compound machines are made by combining ___ or more simple machines. a. 1 b. 3 c. 2
C
A door handle is located 1.7 m from its hinges. If the door is pulled with a force of 15 N what is the torque created in opening the door? a. 25.2 Nm b. 12.7 Nm c. 16.7 Nm d. 8.82 Nm
A
A graph of displacement versus time will be a straight line for uniform motion. Its slope equals the ________ of the object. a. velocity b. distance c. speed d. acceleration
A
Anthony and Sissy are participating in the "Roll-a-Rama" skating dance championship. While 70.0 kg Anthony skates at 3.0 m/s, 60.0 kg Sissy skates in the same direction with a velocity of 5.0 m/s. When she jumps onto his back, how fast does the pair roll together? a. 3.9 m/s b. 4.0 m/s c. 2.0 m/s d. 0.69 m/s
A
At a constant momentum value, how are the variables "m" and "v" related to each other? a. inversely b. directly c. indirectly d. they have no effect on each other
A
Calculate and round to the correct number of digits.11.30 + 11 = ??? a. 22 b. 22.3 c. 22.29 d. 20
A
Capital G is called the universal gravitation constant and has a value of a. 6.67 x 10-11 b. 9.8 c. 3.14159
A
Collisions in which objects stick together or are deformed in some way and lose energy as heat are called ______ collisions. a. inelastic b. total c. elastic
A
Convert 7.51 s to cs. a. 751 b. 75.1 c. .751 d. .0751
A
Find the resultant of the displacements 14 meters East and 11 meters North. a. 18 m, 38o N of E b. 18 m, 38o E of N c. 18 m, 38o S of W d. 18 m
A
For every action force, there is a reaction force of equal magnitude in the opposite direction. This is Newton's ______ Law. a. Third b. Gravitational c. First d. Second
A
Give the magnitude only of the resultant of 4.50 units E and 4.5 units S. a. 6.40 units b. 9.0 units c. 0 units
A
Granny whizzes around a skating rink and is suddenly confronted with little Ambrose at rest directly in her path. Rather than knock him over, Granny picks him up and continues in motion without "braking".After the collision, Granny's speed will a. decrease b. increase c. stay the same d. not enough information given to know this
A
How fast is someone in freefall going after 3.8 s if they started from rest (the acceleration due to gravity is 9.81 m/s/s)? a. 37 m/s b. not enough information c. 2.6
A
How long will it take a car to accelerate at 4.2 m/s2 from rest until it reaches 29 m/s? a. 6.9 s b. 9.6 s c. 3.7 s d. 11 s
A
Momentum is conserved in ____ collisions, but kinetic energy is conserved only in _____ collisions. a. all; elastic b. inelastic; elastic c. all; inelastic d. elastic; inelastic
A
Newton's First Law of Motion is also called the law of _______. a. inertia b. weight c. acceleration d. mass
A
Rotational inertia depends on _____ and distribution of mass. a. mass b. force c. weight d. speed
A
The __________ component of the weight of an object on an inclined plane is the force which presses the object to the surface of the plane. a. perpendicular b. normal c. weight d. parallel
A
The distance from the turning point to the point of contact is the __________ . a. lever arm b. torque c. rotational inertia d. center of mass
A
The lever arm is the distance from the __________ force to the axis of rotation. a. perpendicular b. parallel
A
Torque is the force times the ______________. a. lever arm b. parallel distance c. circular distance
A
Two component vectors have magnitudes of 5 units and 8 units. The resultant of these vectors may have a magnitude of a. any value from 3 to 13 units b. greater than 13 units c. 0 d. less than 3 units
A
Two or more forces acting on the same point at the same time are called ___________ forces. a. concurrent b. equal c. opposite d. resultant
A
Two or more vectors acting on the same point are called ___________. a. components b. arrows c. scalars
A
What is the decimal form of 1.873 x 10^-3? a. 0.001873 b. 0.0001873 c. 1,873,000 d. 1873
A
When a bug hits the windshield of a bus, the bug experiences the greater ____. a. change in velocity b. time of impact c. time and momentum d. force of impact
A
When energy is lost during a collision, it is mostly lost due to _____. a. friction b. the normal force c. impulse d. the weight of the objects
A
Which component force causes a sled to accelerate across level ice? a. horizontal component b. tension c. vertical component d. normal
A
A car's cruise control is set on 55 mi/h as it is driven around a curved track. The car's ... a. speed and velocity are changing b. speed is constant but velocity is changing c. speed and velocity are constant d. speed is changing but velocity is constant
B
A person rows a boat directly west across a stream that flows south. If the person rows the boat faster than the stream flows, the general direction of the resultant velocity will be a. W of S (closer to the S) b. S of W (closer to the W) c. W d. S
B
A person sitting still in a moving airplane is considered to be ..... a. none of these b. motionless in relation to everything in the plane AND in motion compared to everything on the ground c. in motion compared to everything on the ground d. motionless in relation to everything in the plane
B
Calculate and round 19.00 + 5.2 + 0.004 = _____ to the correct number of digits. a. 24.204 b. 24.2 c. 24 d. 20
B
Convert 6200 m/s to km/min. a. 372,000 b. 372 c. 103 d. 6.2
B
If the displacement of a person from their desk is 27 m, 17o S of W, how far west are they from their desk? a. 8.2 m b. 26 m c. 7.9 m
B
If you walk 2 blocks to the store, then walk 2 blocks back home because you forgot your money, then 2 blocks back to the store, your distance traveled is ____________ a. 2 blocks b. 6 blocks c. 8 blocks d. 4 blocks
B
In order for any object to move in a circular path at uniform speed, an inward perpendicular force is necessary. This inward force is known as __________ force. a. circular b. centripetal c. turning d. centrifugal
B
In the equation, F = ma, "F" and "a" are____ a. indirectly related b. directly proportional c. exponentially related d. inversely proportional
B
Mass, time, and volume are examples of _______________ quantities, while weight, displacement, and velocity are examples of _______________ quantities. a. force; vector b. scalar; vector c. vector; scalar d. vector; force
B
State the number of significant digits in the measurement 35.002 mm. a. 3 b. 5 c. 4 d. 2
B
Static friction acts in a direction that is ________ to the surfaces in contact and __________ the applied force. a. opposite, parallel b. parallel, opposite c. opposite, opposite d. parallel, parallel
B
The angular momentum of a closed system of objects is conserved if there is no net external torque acting on the system. This is the Law of Conservation of _______________. a. matter b. angular momentum c. energy d. momentum
B
The individual x and y parts of a vector are called _______. a. rays b. components c. resultants d. arrows
B
Two component vectors have magnitudes of 5 units and 8 units. The resultant of these vectors may have a magnitude of a. 0 b. any value from 3 to 13 c. greater than 13 units d. less than 3 units
B
When all the forces acting on an object are balanced, the object is said to be in a state of ________ equilibrium. a. kinetic b. static c. acceleratory d. inertial
B
Which of the following choices describes rotational motion? a. motion is in a straight line b. some parts of object move faster than others c. object is treated as a single point d. all parts of object move together
B
Which of the following is NOT one of the four fundamental forces in the universe? a. Gravity b. Friction c. Nuclear d. Electromagnetic
B
_________ is the time rate of change in velocity. a. Distance b. Acceleration c. Speed d. Displacement
B
A 3.0 kg book is 4.0 m from a 11 kg table. What is the gravitational force between these two objects? a. 4.6 x 10-10 N b. 1.37569 x 10-10 N c. 1.4 x 10-10 N d. 5.5 x 10-10 N
C
A body at rest will stay at rest unless acted on by an outside force. This is Newton's ________ law. a. 2nd b. 3rd c. 1st d. Gravitational
C
A box weighing 580 newtons is lifted 22 meters straight up in 15 seconds by a machine. What is the power of the machine? a. 390 watts b. .57 watts c. 850 watts
C
A person throws a 7.2 kg ball with a velocity of 6.9 m/s. What is the kinetic energy of the ball? a. 171.396 joules b. 340 joules c. 170 joules d. 25 joules
C
A rubber ball and a ball of equal mass made of modeling clay are thrown at the same velocity at a window. Which is more likely to break the window? a. the clay ball b. neither. They will exert the same force on the window. c. the rubber ball
C
Convert 0.000003291 m to scientific notation. a. 3.3291 x 106 m. b. 3.291 x 106 m. c. 3.291 x 10-6 m. d. 3.3 x 10-6 m.
C
Convert 1.9 x 10 4 m/s to Mm/s. a. .0019 b. 1.9 c. .019 d. 1.9 x 10^7
C
Convert 1.9 x 10 4 m/s to Mm/s. a. 1.9 b. .0019 c. .019 d. 1.9 x 10^7
C
Convert 7.51 s to cs. a. .751 b. .0751 c. 751 d. 75.1
C
Give the magnitude only of the resultant of 32.5 units E and 66.7 units W. a. 74.2 units b. 99.2 units c. 34.2 units
C
Granny whizzes around a skating rink and is suddenly confronted with little Ambrose at rest directly in her path. Rather than knock him over, Granny picks him up and continues in motion without "braking". The collision between Granny and Ambrose is _____. a. This cannot be a collision because cars are not involved. b. not enough information given c. inelastic d. elastic
C
The point where all the weight of an object appears to be concentrated is called the ________________________ . a. pivot point b. middle c. center of gravity d. lever arm
C
The ratio of the force of friction to the normal force for two particular surfaces is a constant called the coefficient of friction and is represented by the Greek symbol________ (mu). a. Δ b. π c. µ d. θ
C
Trig functions like sine, cosine, and tangent ...... a. apply to all triangles b. do not depend on the lengths of the sides of the triangles c. give the ratios of the sides of a right triangle d. do not depend on the angle, θ
C
Two or more forces acting on the same point at the same time can be replaced by the a. horizontal component b. vertical component c. resultant d. equilibrant
C
What is the scientific notation form of 0.0001487? a. 1.487 x 10^-5 b. 1.487 x 10^4 c. 1.487 x 10^-4 d. 1.487 x 10^3
C
When a gymnast goes from an extended position to a tucked position, she _______ her rotational inertia and spins _________. a. decreases; slower b. increases; slower c. decreases; faster d. increases; faster
C
When all concurrent forces acting on an object cancel out and the net force equals zero, the object is in a state of _______. a. instability b. acceleration c. equilibrium
C
When the motion of an object is uniform the object moves at a _________ speed in a straight line. a. variable b. changing c. constant
C
When we combine vector components we get a single vector, called a __________. a. scalar b. quantity c. resultant
C
Which has more rotational inertia - a bicycle wheel or a solid disk of the same mass and diameter? a. the disk b. need more information c. the wheel d. neither
C
Which of the following is NOT an example of a scalar quantity: a. mass b. volume c. velocity d. time
C
Which of the following is not a simple machine? a. wedge b. screw c. scissors d. lever
C
Which of these statements about torque is correct? a. Unbalanced torques always make an object rotate faster. b. It is affected by force and the surface area of the object that is in contact. c. It acts in a clockwise or counterclockwise direction. d. It is expressed in newtons.
C
Which of these units can represent torque? a. N/m b. N c. N⋅m d. N/m2
C
Why is it better to stop a car by running it into a haystack rather than into a brick wall? a. If the velocity is decreased, the force will decrease. b. If the velocity is decreased, the force will increase. c. If the contact time is increased, the force will decrease. d. If the contact time is increased, the force will increase.
C
___________ is the time rate of motion. a. Displacement b. Distance c. Speed
C
"Deceleration" is .... a. a body at rest b. constant velocity c. backwards motion d. negative acceleration
D
A car starts from rest and in 6.8 s has a velocity of 24.3 m. What is the acceleration? a. .28 m/s^2 b. 14 m/s^2 c. 165 m/s^2 d. 3.6 m/s^2
D
A graph that is a straight line represents a relationship that is _____. a. constant and positive b. indirect c. inverse d. direct
D
A woman drives 10 miles east to work. She returns home for lunch and drives back to the office after lunch. The woman's total displacement is ____. a. 30 miles b. 20 miles, E c. 0 miles d. 10 miles, E
D
Collisions in which the objects bounce off each other and separate, without any lasting deformation or energy loss in the form of heat, are called _______ collisions. a. inelastic b. total c. rubber d. elastic
D
Granny whizzes around a skating rink and is suddenly confronted with little Ambrose at rest directly in her path. Rather than knock him over, Granny picks him up and continues in motion without "braking". According to the Law of Conservation of Momentum, after the collision _____. a. Granny's momentum plus Ambrose's momentum must sum to zero b. Granny's momentum cannot change c. Ambrose's momentum cannot change d. the total momentum of the two cannot change
D
How far will a car travel before coming to a stop if its initial velocity is 38 m/s, and it is decelerating at 1.8 m/s2? a. 21 m b. 11 m c. 802 m d. 401 m
D
How many significant digits are in 2.0300 x 107? a. four b. three c. two d. five
D
If the values of "c" and "θ" are known, the value of side "b" can be determined using _____. ("θ " is between "b" and "c".) a. b = c/cos θ b. b = cos θ/c c. b = c. sin θ d. b = c. cos θ
D
In order to play see-saw at the playground, two children must _____. a. have the same mass b. have the same weight c. sit at equal distances from center d. produce equal torque
D
In scientific measurements, how many digits can be estimated? a. 3 b. 0 c. 2 d. 1
D
The best measure of an object's inertia is _______. a. weight b. force c. acceleration d. mass
D
The mathematical expression of Newton's 2nd Law is ______. a. x=vt b. W=mg c. p=mv d. F=ma
D
The symbol for momentum is ______. a. m b. M c. P d. p
D
The units for acceleration are ______. a. ms2 b. m/s c. ms d. m/s/s
D
The units used in the metric system are called ______ units. a. IS b. TI c. DU d. SI
D
The weight of a child is 210 N on Earth. What is the child's mass? a. 2100 N b. 2100 kg c. 21 g d. 21 kg
D
When motion is uniform, velocity is _______ and acceleration is ______. a. constant; constant b. zero; constant c. variable; zero d. constant; zero
D
Which of the following conversions is incorrect? a. 10 dg = 1 g b. 1,000,000 s = 1 Ms c. 1 kg = 1000 g d. 1 cm = 100 m
D
Which of the following is a vector quantity? a. distance b. volume c. mass d. velocity
D
You hang a 15 N mass .38 from the edge of a meter stick. In order to make the stick balance, you hang an unknown mass on the opposite side at a point .12 m from the edge. What is the unknown mass? a. 4.85 kg b. 47.5 kg c. 4.74 kg d. .48 kg
D
Action-reaction forces always involve four forces acting on four separate objects. True or False
False
Action-reaction forces cancel out so that neither object accelerates. True or False
False
An object in a state of equilibrium must be at rest. True or False
False
An object in a state of static equilibrium must be stationary. True or False
False
In fundamental units, a newton is a kilogram meter per second. True or False
False
Kinetic friction is also called starting friction. True or False
False
Machines can multiply force and can multiply work. True or False
False
Mechanical advantage is the ratio of input to output forces. True or False
False
Newton's 2nd Law is also known as the Law of Inertia. True or False
False
Potential energy is an object's energy due to its motion. True or False
False
The force and the displacement must be in opposite directions in order to have work. True or False
False
The vertical component of a projectile's motion is constant. True or False
False
To get the greatest change in velocity, you should exert a large force over a small time interval True or False
False
To solve for components you will need to use sine and tangent. True or False
False
Torque is a scalar. True or False
False
A projectile is moving uniformly in the horizontal direction and accelerating in the vertical direction. True or False
True
Another term for "balanced" is rotational equilibrium. True or False
True
Calculating the resultant of two or more forces is called the composition of forces. True or False
True
Centripetal force is any force that is directed toward the center. True or False
True
Energy is the ability to do work. True or False
True
If you are standing on a scale in an elevator that is accelerating upward the applied force up must be greater than your weight, and you will feel heavier and the scale reading will be greater than your real weight. True or False
True
Instantaneous speed is the speed at a particular moment. True or False
True
Kinetic friction involves objects already in motion and is sometimes called sliding friction. True or False
True
Momentum is inertia in motion. True or False
True
Only net forces actually result in changing motion True or False
True
Only perpendicular forces produce torque. True or False
True
Rotational inertia is the rotational equivalent of mass. True or False
True
The Law of Conservation of Mechanical Energy states that in a closed, isolated system of objects, the total mechanical energy equals potential energy plus kinetic energy and remains constant. True or False
True
The law of conservation of energy states that energy can change form but cannot be created or destroyed. True or False
True
