Question 1

A cannon recoils while firing a cannonball. The speed of the cannon's recoil is relatively small because the

Accepted Answer

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

Question 2

A sandbag motionless in outer space is hit by a three-times-as massive sandbag moving at 12 m/s. 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 the above 
A) 3 m/s. 
B) 4 m/s. 
C) 6 m/s. 
D) 8 m/s. 
E) none of the above

Question 3

The impulse-momentum relationship is a direct result of

Accepted Answer

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

Question 4

An astronaut floating alone in outer space throws a baseball. If the ball moves away at 20 m/s, the astronaut will

Accepted Answer

A) move in the opposite direction at 20 m/s. 
B) move in the opposite direction at a lower speed. 
C) move in the opposite direction at a higher speed. 
D) none of the above 
A) move in the opposite direction at 20 m/s. 
B) move in the opposite direction at a lower speed. 
C) move in the opposite direction at a higher speed. 
D) none of the above

Question 5

When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard, the speed of the skateboard

Accepted Answer

A) decreases. 
B) increases. 
C) neither decreases nor increases. 
A) decreases. 
B) increases. 
C) neither decreases nor increases.

Question 6

When a boxer is moving away from a punch, the force experienced is reduced because

Accepted Answer

A) momentum transfer is reduced. 
B) the time of contact is increased. 
C) the force is less effective. 
D) all of the above 
A) momentum transfer is reduced. 
B) the time of contact is increased. 
C) the force is less effective. 
D) all of the above

Question 7

Consider massive gliders that slide friction-free along a horizontal air track. Glider A has a mass of 1 kg, a speed of 1 m/s, and collides with Glider B that has a mass of 5 kg and is at rest. If they stick upon collision, their speed after collision will be

Accepted Answer

A) 1/4 m/s. 
B) 1/5 m/s. 
C) 1/6 m/s. 
D) 1 m/s. 
E) none of the above 
A) 1/4 m/s. 
B) 1/5 m/s. 
C) 1/6 m/s. 
D) 1 m/s. 
E) none of the above

Question 8

If several balls are thrown straight up with different initial speeds, the quantity that will have the same value along their paths is their

Accepted Answer

A) initial momentum. 
B) maximum height. 
C) time of travel. 
D) acceleration. 
E) none of the above 
A) initial momentum. 
B) maximum height. 
C) time of travel. 
D) acceleration. 
E) none of the above

Question 9

A red car has a head-on collision with an approaching blue car with the same magnitude of momentum. A green car driving with the same momentum as the other cars collides with an enormously massive wall. Which of the three cars will experience the greatest impulse?

Accepted Answer

A) red car 
B) blue car 
C) green car 
D) all the same 
A) red car 
B) blue car 
C) green car 
D) all the same

Question 10

When you jump from an elevated position you usually bend your knees upon reaching the ground, which makes the time of the contact about 10 times that of 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 11

The mass of a ball moving at 3 m/s with a momentum of 48 kg m/s is

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

Exam 6: Momentum

A cannon recoils while firing a cannonball. The speed of the cannon's recoil is relatively small because the

A sandbag motionless in outer space is hit by a three-times-as massive sandbag moving at 12 m/s. They stick together and move at a speed of

The impulse-momentum relationship is a direct result of

An astronaut floating alone in outer space throws a baseball. If the ball moves away at 20 m/s, the astronaut will

When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard, the speed of the skateboard

When a boxer is moving away from a punch, the force experienced is reduced because

Consider massive gliders that slide friction-free along a horizontal air track. Glider A has a mass of 1 kg, a speed of 1 m/s, and collides with Glider B that has a mass of 5 kg and is at rest. If they stick upon collision, their speed after collision will be

If several balls are thrown straight up with different initial speeds, the quantity that will have the same value along their paths is their

A red car has a head-on collision with an approaching blue car with the same magnitude of momentum. A green car driving with the same momentum as the other cars collides with an enormously massive wall. Which of the three cars will experience the greatest impulse?

When you jump from an elevated position you usually bend your knees upon reaching the ground, which makes the time of the contact about 10 times that of a stiff-legged landing. In this way the average force your body experiences is

The mass of a ball moving at 3 m/s with a momentum of 48 kg m/s is

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