Question 1

A large metal ball is shot from a cannon with a short barrel.If the same ball were to be shot from cannon with a longer barrel,its muzzle velocity would be

Accepted Answer

A) less. 
B) more. 
C) the same. 
D) impossible to determine without additional information. 
A) less. 
B) more. 
C) the same. 
D) impossible to determine without additional information. B

Question 2

The change in momentum,in kg m/s,that occurs when a 1.0 kg ball travelling at 4.0 m/s strikes a wall and bounces back at 2.0 m/s is

Accepted Answer

A) 2) 
B) 4) 
C) 6) 
D) 8) 
A) 2) 
B) 4) 
C) 6) 
D) 8) C

Question 3

The conservation of momentum is most closely related to

Accepted Answer

A) Newton's 1st law. 
B) Newton's 2nd law. 
C) Newton's 3rd law. 
D) Newton's 4th law 
A) Newton's 1st law. 
B) Newton's 2nd law. 
C) Newton's 3rd law. 
D) Newton's 4th law C

Question 4

A ball is moving at 3 m/s and has a momentum of 48 kg m/s.What is the ball's mass?

Accepted Answer

A) 4 kg 
B) 12 kg 
C) 16 kg 
D) 144 kg 
E) none of these 
A) 4 kg 
B) 12 kg 
C) 16 kg 
D) 144 kg 
E) none of these

Question 5

Suppose that a tiny gun made of a strong but very light material fires a bullet that is 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. 
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 6

A 1000-kg car moving at 10 m/s brakes to a stop in 5 s.The average braking force is

Accepted Answer

A) 1000 N. 
B) 2000 N. 
C) 3000 N. 
D) 4000 N. 
E) 5000 N. 
A) 1000 N. 
B) 2000 N. 
C) 3000 N. 
D) 4000 N. 
E) 5000 N.

Question 7

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 ball,both move with a combined momentum of

Accepted Answer

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

Question 8

A sandbag is motionless in outer space.A second sandbag with 3 times the mass moving at 12 m/s collides with it.They stick together and move at a speed of

Accepted Answer

A) 3 m/s. 
B) 4 m/s. 
C) 6 m/s. 
D) 8 m/s. 
E) none of these 
A) 3 m/s. 
B) 4 m/s. 
C) 6 m/s. 
D) 8 m/s. 
E) none of these

Question 9

If all people,animals,trains and trucks all over the world began to walk or run towards the east,then the

Accepted Answer

A) Earth would spin a bit faster. 
B) Earth would spin a bit slower. 
C) Earth's spin would not be affected at all. 
A) Earth would spin a bit faster. 
B) Earth would spin a bit slower. 
C) Earth's spin would not be affected at all.

Question 10

To catch a ball,a baseball player extends the hand forward before impact with the ball and then lets it ride backward in the direction of the ball's motion.Doing this reduces the force of impact on the player's hand principally because the

Accepted Answer

A) force of impact is reduced. 
B) relative velocity is less. 
C) time of impact is increased. 
D) time of impact is decreased. 
E) none of these 
A) force of impact is reduced. 
B) relative velocity is less. 
C) time of impact is increased. 
D) time of impact is decreased. 
E) none of these

Question 11

A 4 kg ball has a momentum of 12 kg m/s.What is the ball's speed?

Accepted Answer

A) 3 m/s 
B) 4 m/s 
C) 12 m/s 
D) 48 m/s 
E) none of these 
A) 3 m/s 
B) 4 m/s 
C) 12 m/s 
D) 48 m/s 
E) none of these

Question 12

A 5000-kg freight car runs into a 10,000-kg freight car at rest.They couple upon collision and move with a speed of 2 m/s.What was the initial speed of the 5000-kg car?

Accepted Answer

A) 4 m/s 
B) 5 m/s 
C) 6 m/s 
D) 8 m/s 
E) none of these 
A) 4 m/s 
B) 5 m/s 
C) 6 m/s 
D) 8 m/s 
E) none of these

Question 13

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 have a greater

Accepted Answer

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

Question 14

A rifle recoils while firing a bullet.The speed of the rifle's recoil is small because the

Accepted Answer

A) force against the rifle is smaller than against the bullet. 
B) momentum is mainly concentrated in the bullet. 
C) rifle has much more mass than the bullet. 
D) momentum of the rifle is smaller. 
A) force against the rifle is smaller than against the bullet. 
B) momentum is mainly concentrated in the bullet. 
C) rifle has much more mass than the bullet. 
D) momentum of the rifle is smaller.

Question 15

A 1-N apple falls to the ground.The apple hits the ground with an impact force of about

Accepted Answer

A) 1 N. 
B) 2 N. 
C) 4 N. 
D) 9)8 N. 
E) not enough information given to say 
A) 1 N. 
B) 2 N. 
C) 4 N. 
D) 9)8 N. 
E) not enough information given to say

Question 16

Compared to falling on a stone floor,a wine glass may not break when it falls on a carpeted floor because the

Accepted Answer

A) carpeted floor provides a smaller impulse. 
B) stopping time is shorter on the carpet. 
C) stopping time is longer on the carpet. 
D) carpet provides a smaller impulse and a longer time. 
A) carpeted floor provides a smaller impulse. 
B) stopping time is shorter on the carpet. 
C) stopping time is longer on the carpet. 
D) carpet provides a smaller impulse and a longer time.

Question 17

A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball that is initially at rest on a frictionless surface.The speed of the putty thereafter is

Accepted Answer

A) 1/4 m/s. 
B) 1/5 m/s. 
C) 1/6 m/s. 
D) impossible to solve with the information given. 
A) 1/4 m/s. 
B) 1/5 m/s. 
C) 1/6 m/s. 
D) impossible to solve with the information given.

Question 18

When you jump from an elevated position you usually bend your knees upon reaching the ground.By doing this,you make the time of the impact about 10 times as great as for a stiff-legged landing.In this way the average force your body experiences is

Accepted Answer

A) less than 1/10 as great. 
B) more than 1/10 as great. 
C) about 1/10 as great. 
D) about 10 times as great. 
A) less than 1/10 as great. 
B) more than 1/10 as great. 
C) about 1/10 as great. 
D) about 10 times as great.

Question 19

Which of the following has the largest momentum relative to the 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 dog running down the street 
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 dog running down the street

Question 20

It is correct to say that impulse is equal to

Accepted Answer

A) momentum. 
B) the change in momentum it produces. 
C) the force multiplied by the distance the force acts. 
D) velocity multiplied by time. 
A) momentum. 
B) the change in momentum it produces. 
C) the force multiplied by the distance the force acts. 
D) velocity multiplied by time.

Exam 6: Momentum

A large metal ball is shot from a cannon with a short barrel.If the same ball were to be shot from cannon with a longer barrel,its muzzle velocity would be

The change in momentum,in kg m/s,that occurs when a 1.0 kg ball travelling at 4.0 m/s strikes a wall and bounces back at 2.0 m/s is

The conservation of momentum is most closely related to

A ball is moving at 3 m/s and has a momentum of 48 kg m/s.What is the ball's mass?

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

A 1000-kg car moving at 10 m/s brakes to a stop in 5 s.The average braking force is

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 ball,both move with a combined momentum of

A sandbag is motionless in outer space.A second sandbag with 3 times the mass moving at 12 m/s collides with it.They stick together and move at a speed of

If all people,animals,trains and trucks all over the world began to walk or run towards the east,then the

To catch a ball,a baseball player extends the hand forward before impact with the ball and then lets it ride backward in the direction of the ball's motion.Doing this reduces the force of impact on the player's hand principally because the

A 4 kg ball has a momentum of 12 kg m/s.What is the ball's speed?

A 5000-kg freight car runs into a 10,000-kg freight car at rest.They couple upon collision and move with a speed of 2 m/s.What was the initial speed of the 5000-kg car?

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 have a greater

A rifle recoils while firing a bullet.The speed of the rifle's recoil is small because the

A 1-N apple falls to the ground.The apple hits the ground with an impact force of about

Compared to falling on a stone floor,a wine glass may not break when it falls on a carpeted floor because the

A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball that is initially at rest on a frictionless surface.The speed of the putty thereafter is

When you jump from an elevated position you usually bend your knees upon reaching the ground.By doing this,you make the time of the impact about 10 times as great as for a stiff-legged landing.In this way the average force your body experiences is

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

It is correct to say that impulse is equal to

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