Question 1

Two identical freight cars roll without friction (one at 1 m/s, the other at 2 m/s) toward each other on a level track. They collide, couple together, and roll away in the direction of

Accepted Answer

A)  the slower car.
B)  the faster car.
C)  neither, for they stop.

Question 2

As Bronco Brown steps off a hovering high-flying helicopter and falls through the air, he experiences

Accepted Answer

A)  an impulse.
B)  an increasing speed.
C)  a decreasing acceleration.
D)  all of the above

Question 3

Which has the greater momentum when moving?

Accepted Answer

A)  a container ship
B)  a bullet
C)  either of these depending on speed C

Question 4

A karate expert executes a swift blow and breaks a cement block with her bare hand. The magnitude of the force on her hand is

Accepted Answer

A)  zero.
B)  less than the force applied to the cement block.
C)  the same as the force applied to the block.
D)  more than the force applied to the block.
E)  need more information

Question 5

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

Accepted Answer

A)  less than 1 unit.
B)  more than 1 unit.
C)  1 unit.
D)  not enough information

Question 6

A same-size iron ball and wooden ball are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater

Accepted Answer

A)  speed.
B)  acceleration.
C)  momentum.
D)  all of the above
E)  none of the above C

Question 7

A 5-kg shark swimming at 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the shark after his meal is

Accepted Answer

A)  1/2 m/s.
B)  1/5 m/s.
C)  1/6 m/s.
D)  2/3 m/s.
E)  3/2 m/s.

Question 8

A motorcycle of mass 100 kilograms slowly rolls off the edge of a cliff and falls for three seconds before reaching the bottom of a gully. Its momentum upon hitting the ground is

Accepted Answer

A)  1,000 kg m/s.
B)  2,000 kg m/s.
C)  3,000 kg m/s.
D)  4,000 kg m/s.
E)  9,000 kg m/.

Question 9

Which produces more force: driving into a very massive concrete wall with no "give," or having a head-on collision with an identical car moving toward you at the same speed?

Accepted Answer

A)  car
B)  wall
C)  both the same
D)  need more information

Question 10

A 2-kg rifle that is suspended by strings fires a 0.01-kg bullet at 200 m/s. The recoil velocity of the rifle is about

Accepted Answer

A)  0.001 m/s.
B)  0.01 m/s.
C)  0.1 m/s.
D)  1 m/s.
E)  none of these

Question 11

Two identical gliders slide toward each other on an air track. One moves at 1 m/s and the other at 2 m/s. They collide, stick, and moves at

Accepted Answer

A)  1/2 m/s.
B)  1/3 m/s.
C)  1/6 m/s.
D)  3/4 m/s.
E)  1.5 m/s.

Question 12

When a vertically falling firecracker bursts, the vector sum of momentum fragments

Accepted Answer

A)  in the horizontal direction cancels to zero.
B)  in the vertical direction equals the momentum of the firecracker before bursting.
C)  both of these
D)  neither of these

Question 13

A tiny gun made of a strong but very light material fires a bullet more massive than the gun itself. For such a weapon

Accepted Answer

A)  the target would be safer than the shooter.
B)  recoil problems would be lessened.
C)  conservation of energy would not hold.
D)  conservation of momentum would not hold.
E)  both conservation of energy and momentum would not hold.

Question 14

Which of the following has the largest momentum relative to Earth's surface?

Accepted Answer

A)  a tightrope walker crossing Niagara Falls
B)  a pickup truck speeding along a highway
C)  a Mack truck parked in a parking lot
D)  the Science building on campus
E)  a mouse running across your room

Question 15

The force on a dropped apple hitting the ground depends upon

Accepted Answer

A)  the speed of the apple just before it hits.
B)  the time of contact with the ground.
C)  whether or not the apple bounces.
D)  all of the above D

Question 16

A falling 1-N apple hits the ground with a force of about

Accepted Answer

A)  1 N.
B)  2 N.
C)  4 N.
D)  10 N.
E)  need more information

Question 17

You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater change in momentum during the time of contact?

Accepted Answer

A)  the bug
B)  your car
C)  both the same

Question 18

The total momentum of a flock of identical birds could be zero only if the birds are

Accepted Answer

A)  taking off from the ground.
B)  flying in the same direction.
C)  flying in different directions.
D)  very tired and coming down to rest.

Question 19

A large heavy truck and a small baby carriage roll down a hill. Neglecting friction, at the bottom of the hill, the baby carriage will likely have

Accepted Answer

A)  less momentum.
B)  about the same momentum.
C)  more momentum.

Question 20

When bullets are fired from an airplane in the forward direction, the momentum of the airplane is

Accepted Answer

A)  decreased.
B)  unchanged.
C)  increased.

Exam 6: Momentum

Two identical freight cars roll without friction (one at 1 m/s, the other at 2 m/s) toward each other on a level track. They collide, couple together, and roll away in the direction of

Correct AnswerverifiedShow Answer

As Bronco Brown steps off a hovering high-flying helicopter and falls through the air, he experiences

Correct AnswerverifiedShow Answer

Which has the greater momentum when moving?

Correct AnswerverifiedC

A karate expert executes a swift blow and breaks a cement block with her bare hand. The magnitude of the force on her hand is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A same-size iron ball and wooden ball are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater

Correct AnswerverifiedC

A 5-kg shark swimming at 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the shark after his meal is

Correct AnswerverifiedShow Answer

A motorcycle of mass 100 kilograms slowly rolls off the edge of a cliff and falls for three seconds before reaching the bottom of a gully. Its momentum upon hitting the ground is

Correct AnswerverifiedShow Answer

Which produces more force: driving into a very massive concrete wall with no "give," or having a head-on collision with an identical car moving toward you at the same speed?

Correct AnswerverifiedShow Answer

A 2-kg rifle that is suspended by strings fires a 0.01-kg bullet at 200 m/s. The recoil velocity of the rifle is about

Correct AnswerverifiedShow Answer

Two identical gliders slide toward each other on an air track. One moves at 1 m/s and the other at 2 m/s. They collide, stick, and moves at

Correct AnswerverifiedShow Answer

When a vertically falling firecracker bursts, the vector sum of momentum fragments

Correct AnswerverifiedShow Answer

A tiny gun made of a strong but very light material fires a bullet more massive than the gun itself. For such a weapon

Correct AnswerverifiedShow Answer

Which of the following has the largest momentum relative to Earth's surface?

Correct AnswerverifiedShow Answer

The force on a dropped apple hitting the ground depends upon

Correct AnswerverifiedD

A falling 1-N apple hits the ground with a force of about

Correct AnswerverifiedShow Answer

You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater change in momentum during the time of contact?

Correct AnswerverifiedShow Answer

The total momentum of a flock of identical birds could be zero only if the birds are

Correct AnswerverifiedShow Answer

A large heavy truck and a small baby carriage roll down a hill. Neglecting friction, at the bottom of the hill, the baby carriage will likely have

Correct AnswerverifiedShow Answer

When bullets are fired from an airplane in the forward direction, the momentum of the airplane is

Correct AnswerverifiedShow Answer

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C

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C

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D

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