Physics Final Multiple Choice
A 10 N object moves at 1 m/s, Its kinetic energy is __________. A) .5 J B) 1 J C) 10 J E) more than 10 J
A) .5 J
A person on a roof throws one ball downward and an identical ball upward at the same speed. The ball thrown downward hits the ground with 100 J of kinetic energy. Ignoring air friction, with how much kinetic energy does the second ball hit the ground? A) 100 J B) 200 J C) less than 100 J D) more than 200 J E) none of the above
A) 100 J
A 4-kg ball has a momentum of 12 kgm/s. What is the ball's speed? A) 3 m/s B) 4 m/s C) 12m/s D) 48 m/s E) none of the above
A) 3 m/s
How much joules of work are done on an object when a force of 10 N pushes it 5 m? A) 50 J B) 10 J C) 5 J D) 2 J E) 1 J
A) 50 J
How much work is done on a 50 N rich that you lift 10 meters? A) 500 J B) 50 J C) 10 J D) 1 J E) 0 J
A) 500 J
How much power is expended if you lift a 50 N rock 10 meters in 1 second? A) 500 W B) 50 W C) 10 J D) 1 J E) 0 J
A) 500 W
Suppose a moving car has 2000 J of kinetic energy. If the car's speed doubles, how much kinetic energy would it then have? A) 8000 J B) 6000 J C) 4000 J D) 2000 J E) 1000 J
A) 8000 J
Energy is changed from one form to another with no net loss or gain. A) always true B) sometimes true C) always false
A) always true
Cannonballs are launched from an airplane in the forward direction of motion. The momentum of the airplane will be ____________. A) decreased B) unchanged C) increased
A) decreased
Consider molecules of hydrogen gas and molecules of heavier oxygen gas that have the same kinetic energy. The molecules with more speed are ___________. A) hydrogen B) oxygen C) both have the same speed
A) hydrogen
If Earth rotated more slowly about its axis, your weight would A) increase B) decrease C) stays the same
A) increase
Stunt motorcyclist Biker Bob rides his bike inside a futuristic rotating space station- a giant rotating donut-shaped structure in space. The normal support force feels like weight to him. As he rides his bike in the opposite direction to the station's rotation, the normal force... A) increases B) decreases C) remains unaffected
A) increases
A ball is thrown into the air with 100 J of kinetic energy, which is transformed to gravitational potential energy at the top of its trajectory. When it returns to its original level after encountering air resistance, its kinetic energy is _______. A) less than 100 J B) more than 100 J C) 100 J D) not enough information given
A) less than 100 J
An object that has kinetic energy must have ________. A) momentum B) acceleration C) a force applied to maintain it D) none of the above
A) momentum
If the velocity of a moving object doubles, then what else doubles? A) momentum B) kinetic energy C) acceleration D) all of the above E) none of the above
A) momentum
An object that has kinetic energy must be __________. A) moving B) falling C) elevated D) at rest
A) moving
An object that has linear kinetic energy must be ____________. A) moving B) at an elevated position C) at rest D) none of the above
A) moving
Kinetic energy of an object is equal to __________. A) One half the product of its mass times its speed squared B) one half the product of its mass times its speed C) its mass multiplied by its speed D) its mass multiplied by its acceleration E) its mass multiplies by its acceleration squared
A) one half the product of its mass times its speed squared
A person weighs less at the equator than at the poles. The reason for this has to do with the_____. A) spin of the earth B) tidal bulges C) higher temperature at the equator, and expansion of matter D) influence of the sun, moon, and all the planets E) none of the above
A) spin of the earth
Which has more momentum, a large truck moving at 30 miles per hour or a small truck moving at 30 miles per hour? A) the large truck B) the small truck C) both have the same momentum
A) the large truck
Which has the greatest linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail? A) the outside horse B) the inside horse C) neither- they both have the same linear speed
A) the outside horse
Suppose a cannon is made of a strong but very light material. Suppose also that the cannonball is more massive than the cannon itself. For such a system A) the target would have to be a safer place than where the operator is located B) recoils problems would be lessened C) conservation of energy would not hold D) conservation of momentum would not hold E) the force on the cannonball would be greater than the force on the cannon
A) the target would have to be a safer place than where the operator is located
A possible space habitat of the future is a cylinder in space rotating about its axis. What is the relative gravitational; field along the axis of the habitat? A) zero B) g C) one quarter g D) one half g E) three quarters g
A) zero
Recoil is noticeable if you throw a heavy ball while standing on roller skates. If instead you go through the motions of throwing the ball but hold onto it, your net recoil velocity will be A) zero B) the same as before C) small but noticeable
A) zero
While rollerblading, Granny collides with her tiny grandson Ambrose who is at rest. Ignoring any friction effects, Ambrose's speed after the collision will be greatest when __________. A) he and granny make a bouncing collision, each other going separate ways B) granny catches him and they both move together
A)he and granny make a bouncing collision, each other going separate ways
A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball initially at rest. The bowling ball and putty then move with a momentum of A) 0 kgm/s B) 1 kgm/s C) 2 kgm/s D) 5 kgm/s E) more than 5 kgm/s
B) 1 kgm/s
It takes 40 J to push a large box 4 m across a floor. Assuming the push is in the same direction as the move, what is the magnitude of the force on the box? A) 4 N B) 10 N C) 40 N D) 160 N E) none of the above
B) 10 N
A ball is moving at 4 m/s and has a momentum of 48 lim/s. What is the ball's mass? A) 4 kg B) 12 kg C) 48 kg D) 192 kg E) none of the above
B) 12 kg
An arrow in bow had 70 J of potential energy. Assuming no loss of energy due to heat, how much kinetic energy will it have after it has been shot? A) 140 J B) 70 J C) 50 J D) 35 J E) 0 J
B) 70 J
Which of the following has the largest momentum? A) a tightrope walker crossing niagra falls B) a pickup truck traveling down the highway C) a mack truck parked in a parking lot D) the science building at school E) a dog running down the street
B) a pickup truck traveling down the highway
Stunt motorcyclist Biker Bob rides his bike inside a futuristic rotating space station- a giant rotating donut shaped structure in space. The normal support force feels like weight to him. A he rides his bike in the opposite direction that the station rotates, the normals force A) increases B) decreases C) remains unaffected
B) decreases
A freight train rolls along a track with considerable momentum. If it were to roll at the same speed but had twice as much mass, its momentum would be A) zero B) doubles C) quadruples D) unchanged
B) doubles
A popular swinging apparatus consists of an aligned row of identical elastic balls suspended by strings so they touch each other. When two balls on one end are elevated and released, they slam into the array of balls and two ball pop out the other side. If instead, one ball popped out with twice the speed, this would be a violation of the conservation of ___________. A) momentum B) energy C) both
B) energy
If kelly the skaters speed increases so he has twice the momentum, then his kinetic energy increases by A) two times B) four times C) eight times D) none of the above (KE remains the same)
B) four times
How much farther will a car traveling at 100 km/s skid than the same car traveling at 50 km/s? A) five times as far B) four times as far C) twice as far D) the same distance E) half as far
B) four times as far
A woman can lift barrels a vertical distance of 1 meter or can roll them up a 2 meter long ramp to the same elevation. If she uses the ramp, the applied force required is_________. A) one quarter as much B) half as much C) twice as much D) four times as much E) the same amount
B) half as much
When a railroad train rounds a banked track, the centripetal force needed comes not from friction, but from the A) normal force B) horizontal component of the normal force C) vertical component of the normal force D) none of the above
B) horizontal component of the normal force
Nellie Newton swings a rock into a circular path while holding an attached string overhead. The string makes a 45-degree angle to the vertical. The centripetal force that holds the rock in its circular path is the A) tension in the string B) horizontal component of the string tension C) vertical component of the string tension D) none of the above
B) horizontal component of the string tension
A cannonball shot from a long-barrel cannon travels faster than one shot from a short-barrel cannon because the cannonball receives a greater A) force B) impulse C) both a and b D) neither a or b
B) impulse
As the rotation speed of a space habitat increases, the weight of the people inside... A. Stays the same B. Increases C. Decreases
B) increases
What is the direction of the force that acts on clothes in the spin cycle of washing? A) outward B) inward C) up D) down
B) inward
A car travels in a circle with constant speed. The net force on the car________. A) is directed forward, in the direction of travel B) is directed toward the center of the curve C) is zero because the car is not accelerating D) none of the above
B) is directed toward the center
Potential energy is the energy an object has because of its________. A) speed B) location C) size D) temperature E) density
B) location
The momentum of an object is defined as the object's A) mass times it acceleration B) mass times its velocity C) force times its acceleration D) force times the time interval E) velocity times the time interval
B) mass times its velocity
If an object has kinetic energy, then it also must have _________. A) impulse B) momentum C) acceleration D) force E) none of the above
B) momentum
A golf ball moving forward with 1 unit of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of A) less than 1 unit B) more than 1 unit C) 1 unit D) not enough information
B) more than 1 unit
A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of work but different amount of _____. A) energy B) power C) both A and B D) none of the above
B) power
To weigh less in the Northern hemisphere, you should go A) north B) south C) east D) west
B) south
Superman is at rest in space when he throws an asteroid that has more mass than he does. Which moves faster, Superman or the asteroid? A) the asteroid B) superman C) they both move at the same speed
B) superman
Which has greater kinetic energy, a car traveling at 30 km/h or a half-as-massive car traveling at 60 km/h? A) the 30 km/h car B) the 60 km/h car C) both have the same kinetic energy
B) the 60 km/h car
Suppose an astronaut in outer space wishes to toss a ball against a very massive and perfectly elastic concrete wall and catch it as it bounces back. If the ball is as massive as the astronaut, then A) the astronaut will catch one bounce only B) the astronaut will never catch the first bounce C) the astronauts time between catches will decrease as the gam progresses D) none of the above
B) the astronaut will never catch the first bounce
If all people, animals, and trucks all over the world began to walk or run towards the east, then A) the earth would spin a bit faster B) the earth would spin a bit slower C) the earth's spin would not be affected at all
B) the earth would spin a bit slower
Momentum of a system is conserved only when A) there are no forces acting on the system B) there is no net external force acting on the system C) there are no internal forces acting on the system D) the system is not moving E) the system has zero momentum
B) there is no net external force acting on the system
Suppose a girl is standing on a pond where there is no friction between her feet and the ice. In order to get off the ice, she can A) bend over touching the ice in front of her, then bring her feet to her hands B) throw something in the direction opposite to that in which she wants to go C) walk very slowly on tiptoe D) get on her hands and knees and crawl off the ice E) all of the above will work
B) throw something in the direction opposite to that in which she wants to go
If you lift one load up two stories, how much work do you do compared to lifting one load up only one story? A) four times as much B) twice as much C) the same amount D) one half as much E) one quarter as much
B) twice as much
If you lift two loads up one story, how much do you so compared to lifting just one load up one story? A) four times as much B) twice as much C) the same amount D) one half as much E) one quarter as much
B) twice as much
Compared to a sports car moving at 30 mph, the same sports car moving at 60 mph has ______. A) the same momentum B) twice as much momentum C) both have the same momentum
B) twice as much momentum
The unit of power is the ___________. A) newton B) watt C) meter D) joule E) second
B) watt
A small economy car (low mass) and a limo (high mass) are pushed from rest across a parking lot, equal distances with equal forces. The car that receives the greater impulse is the A) economy car B) limo C) neither
B)limo
A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball that is initially at rest. After the putty sticks to the bar, both are set in motion with a combines momentum that is A) less than 1 unit B) more than 1 unit C) 1 unit D) not enough information to say
C) 1 unit
People in the future may well live inside a rotating space structure that is more than 2 km in diameter. Inside the structure, people on the inside of the outer edge will experience 1 g while people halfway to the axis will experience A) 2 g B) 1 g C) 1/2 g D) 1/4 g E) 0 g
C) 1/2 g
How much power is required to do 100 J of work on an object in 2 seconds? A) 200 W B) 100 W C) 50 W D) 2 W E) 0 W
C) 50 W
A 2-kg ball is thrown at 3 m/s. What is the ball's momentum? A) 2 kgm/s B) 3 kgm/s C) 6 kgm/s D) 9kgm/s E) none of the above
C) 6 kgm/s
When you jump off a step, you usually bend your knees as you reach the ground. By doing this, the time of the impact is about 10 times more what it would be in a stiff-legged landing, and the average force on your body is reduced by A) less than 10 times B) more than 10 times C) about 10 times
C) about 10 times
Which requires more work: lifting a 50 kg sack vertically 2 meters or lifting a 25 kg sack vertically 4 meters? A) lifting the 50 kg sack B) lifting the 25 kg sack C) both require the same amount of work
C) both require the same amount of work
A cannon recoils from launching a cannonball. The speed of the cannon's recoil is small because the A) force against the cannon is relatively small B) impulse on the cannon is less than the impulse on the cannonball C) cannon has far more mass than the cannonball D) momentum of the cannon is unchanged E) none of the above
C) cannon has far more mass than the cannonball
An object at rest may have _______. A) speed B) velocity C) energy D) momentum E) none of the above
C) energy
If you whirl a tin can on the end of a string and the string suddenly breaks, the can will ________. A) fly directly away from you B) fly directly toward you C) fly off, tangent to its circular path D) spiral away from you hand E) spiral in toward your hand
C) fly off, tangent to its circular path
In physics, work is defined as ________. A) force times time B) force divided by time C) force times distance D) force divided by distance E) distance divided by time
C) force times distance
If Nellie Newton pushes an object with twice the force for twice the distance, she does _________. A) the same work B) twice the work C) four times the work D) eight times the work
C) four times the work
The momentum change of an object is equal to the _______. A) force acting on it B) velocity change of the object C) impulse acting on it D) objects mass times the force acting on it E) force acting on it times its velocity
C) impulse acting on it
The reason padded dashboards are used in cars is that they A) look nice and feel good B) increase the force of impact in a collision C) increase the time of impact in a collision D) decrease the momentum of a collision E) decrease the impulse in a collision
C) increase the time of impact in a collision
Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has a higher A) speed B) acceleration C) momentum D) all of the above E) none of the above
C) momentum
Which has the greatest angular speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail? A) outside horse B) inside horse C) neither- they both have the same angular speed
C) neither- they both have the same angular speed
A moving freight car runs into an identical car at rest on the track. The cars couple together. Compared to the velocity of the first car before the collision, the velocity of the combined cars after the collision is A) twice as large B) the same C) one half as large D) zero E) more information is needed
C) one half as large
A small economy car (low mass) and a limo (high mass) are pushed from rest across a parking lot, equal distances with equal forces. The car that receives more change in kinetic energy is the _________. A) small economy car B) limousine C) same for each
C) same for each
A ladybug rests on the bottom of a tin can that is being whirled horizontally on then end of a string. Since the ladybug, like the can, moves in a circle, there must be a force on it. What exerts this force? A) your hand B) the string C) the can D) gravity E) there is no force acting on it
C) the can
The centripetal force exerted on stunt motorcyclist Biker Bob while riding on the inner vertical surface of a circular track is A) his weight B) friction C) the normal force D) none of the above
C) the normal force
A ping ball launcher is fired. Compared to the force on ball, the impulse on the launcher is ______. A)larger B) smaller C) the same
C) the same
A ping pong ball launcher is fired. Compared to force on the ball, the force on the launcher is A) larger B) smaller C) the same
C) the same
In order to catch a ball, a baseball player moves his or her hand backward in the direction of the ball's motion. Doing this reduces the force of impact on the player's hand principally because A) the velocity of the hand is reduced B) the momentum of impact is reduced C) the time of impact is increased D) the time of impact is decreased E) none of the above
C) the time of impact is increased
Power is defined as the ________. A) force on an object times the distance the object moves B) force on an object divided by the time the force acts C) work done on an object divided by the time taken to do the work D) work done times the time taken to do that work E) distance divided by the time taken to move that distance
C) work done on an object divided by the time taken to do the work
A car traveling along the highway needs a certain amount of force exerted on it to stop. More stopping force may be required when the car has A) more mass B) more momentum C) less stopping distance D) all of the above E) none of the above
D) all of the above
A karate expert executes a swift blow and severs a cement block with her bare hand A) the impulse on both the block and the expert's hand have the same magnitude B)The force on both the block and the experts hand have the same magnitude C) the time of impact on both the block and the expert's hand is the same D) all of the above E) none of the above
D) all of the above
If the momentum of an object changes and its mass remains constant A) its velocity is changing B) it is accelerating or decelerating C) there is a force acting on it D) all of the above E) none of the above
D) all of the above
Centrifugal forces are an apparent reality to observers in a reference frame that is A) moving at constant velocity B) An inertial reference frame C) at rest D) centripetally accelerating E) none of the above
D) centripetally accelerating
The force that accelerates a rocket in outer space is exerted on the rocket by the A) earths gravity B) rockets wings C) atmospheric pressure D) exhaust gases E) none of the above
D) exhaust gases
A canon fires a cannonball. The speed of the cannonball will be the same as the speed of the recoiling cannon A) because momentum is conserved B) because velocity is conserved C) because both velocity and momentum are conserved D) if the mass of the cannonball equals the mass of the cannon E) noen of the above
D) if the mass of the cannonball equals the mass of the canon
The unit of work is the __________. A) newton B) watt C) meter D) joule E) second
D) joule
Which of the following is not a unit of rotational speed? A) revolutions per second B) rotations per seconds C) revolutions per minute D) meters per second E) rotations per minute
D) meters per second
The amount of potential energy possessed by an elevated object is equal to __________. A) the force needed to lift it B) the distance it is lifted C) the power used to lift it D) the work done in lifting it E) the value of the acceleration fir to gravity
D) the work done in lifting it
A tin can whirled on the end of a string moves in a circle because A) once the can starts moving, that is its natural tendency B) the can continually pulls on the string C) there is a force on the can pulling it outward D) there is an inward force acting on the can E) all of the above
D) there is an inward force acting on the can
Two gliders having the same mass and speed move toward each other on an air track and stick together. After the collision, the velocity of the gliders is A) twice the original velocity B) the same as the original velocity C) one half the original velocity D) zero E) there is not enough information to say
D) zero
How much work is done on a 50 N rock that you carry horizontally across a 10 m room? A) 500 J B) 50 J C) 10 J D) 5 J E) 0 J
E) 0 J
A collision is considered elastic if A) there is no sound generated during the collision B) there is no lasting deformation C) the objects that collide don't get hot D) after the collision, the objects have the same shape as before the collision E) all of the above
E) all of the above
As a pendulum swings back and forth__________. A) potential energy is transformed into kinetic energy B) kinetic energy is transformed into potential energy C) at the lowest part of its swing, its energy is all kinetic D) at the end points of its swing, its energy is all potential E) all of the above
E) all of the above
In order to increase the final momentum of a golf ball, we could A) increase the force acting on it B) increase the time of contact with the ball C) follow through when hitting the ball D) swing as hard as possible E) all of the above
E) all of the above
The force of an apple hitting the ground depends upon A) air resistance on the apple as it falls B) the speed of the apple just before it hits C) the time of impact with the ground D) whether or not the apple bounces E) all of the above
E) all of the above
A heavy object and a light object are released from rest at the same height and time in a vacuum. As they fall, they have equal _________. A) weights B) momenta C) energies D) all of the above E) none of the above
E) none of the above
A 1-N apple falls to the ground. The apple hits the ground with an impact force of about A) 1 N B) 2 N C) 6 N D) 9.8 N E) not enough information to say
E) not enough information to say