Question 1

A softer landing occurs when an falling object bounces from a surface

Accepted Answer

A) in a extended time. 
B) quickly. 
C) either of these 
D) neither of these 
A) in a extended time. 
B) quickly. 
C) either of these 
D) neither of these

Question 2

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

Accepted Answer

A) 0 kg m/s. 
B) 1 kg m/s. 
C) 2 kg m/s. 
D) 5 kg m/s. 
E) more than 5 kg m/s. 
A) 0 kg m/s. 
B) 1 kg m/s. 
C) 2 kg m/s. 
D) 5 kg m/s. 
E) more than 5 kg m/s.

Question 3

Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be

Accepted Answer

A) zero. 
B) the same as before. 
C) small, but noticeable. 
A) zero. 
B) the same as before. 
C) small, but noticeable.

Question 4

A bungee jumper attains a speed of 30 m/s just as the bungee cord begins to stretch. If the period of stretch is 2 s while coming to a halt, the jumper's average deceleration is about

Accepted Answer

A) 0.5 g. 
B) g. 
C) 1.5 g. 
D) 2 g. 
A) 0.5 g. 
B) g. 
C) 1.5 g. 
D) 2 g.

Question 5

A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared with the force that stops the car, the force needed to stop the truck is

Accepted Answer

A) greater. 
B) smaller. 
C) the same. 
A) greater. 
B) smaller. 
C) the same.

Question 6

A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball that is initially at rest. Both move with a combined momentum of

Accepted Answer

A) less than 1 unit. 
B) more than 1 unit. 
C) 1 unit. 
D) need more information 
A) less than 1 unit. 
B) more than 1 unit. 
C) 1 unit. 
D) need more information

Question 7

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 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 8

An open freight car rolls friction free along a horizontal track in a pouring rain that falls vertically. As water accumulates in the car, the car's speed

Accepted Answer

A) increases. 
B) decreases. 
C) doesn't change. 
D) need more information 
A) increases. 
B) decreases. 
C) doesn't change. 
D) need more information

Question 9

A 5-kg fish swimming at 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after lunch is

Accepted Answer

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

Question 10

A karate chop is more effective if one's hand

Accepted Answer

A) follows through upon impact. 
B) bounces upon impact. 
C) extends the time upon impact. 
A) follows through upon impact. 
B) bounces upon impact. 
C) extends the time upon impact.

Question 11

A 5000-kg freight car moving at 2 m/s collides with a 10,000-kg freight car at rest. They couple upon collision and move away at

Accepted Answer

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

Question 12

Padded dashboards in cars are safer in an accident than non-padded ones because passengers hitting the dashboard encounter

Accepted Answer

A) lengthened time of contact. 
B) shorter time of contact. 
C) decreased impulse. 
D) increased momentum. 
A) lengthened time of contact. 
B) shorter time of contact. 
C) decreased impulse. 
D) increased momentum.

Question 13

The greater efficiency achieved with the curved blades of a Pelton wheel is due to

Accepted Answer

A) bouncing. 
B) greater time of water impact. 
C) rotational momentum. 
D) divided impulse. 
A) bouncing. 
B) greater time of water impact. 
C) rotational momentum. 
D) divided impulse.

Question 14

A fan attached to an ice sailcraft stalled on a windless day blows air into the sail that bounces backward upon impact. The boat

Accepted Answer

A) moves in the direction of the wind impact force. 
B) does not move by this wind impact. 
C) moves, but in the opposite direction of the wind impact force. 
A) moves in the direction of the wind impact force. 
B) does not move by this wind impact. 
C) moves, but in the opposite direction of the wind impact force.

Question 15

A car traveling along the highway brakes to a stop over a certain distance. More braking force is required if the car has

Accepted Answer

A) more mass. 
B) more momentum. 
C) less stopping distance. 
D) all of the above 
E) none of the above 
A) more mass. 
B) more momentum. 
C) less stopping distance. 
D) all of the above 
E) none of the above

Question 16

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

Accepted Answer

A) 2 kg m/s. 
B) 4 kg m/s. 
C) 6 kg m/s. 
D) 8 kg m/s. 
A) 2 kg m/s. 
B) 4 kg m/s. 
C) 6 kg m/s. 
D) 8 kg m/s.

Question 17

A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. They collide and stick. The combined mass moves at

Accepted Answer

A) 0 m/s. 
B) 1/2 m/s. 
C) 1/3 m/s. 
D) 1/6 m/s. 
E) 1.5 m/s. 
A) 0 m/s. 
B) 1/2 m/s. 
C) 1/3 m/s. 
D) 1/6 m/s. 
E) 1.5 m/s.

Question 18

If a monkey floating in outer space throws his hat away, the hat and the monkey will both

Accepted Answer

A) move away from each other, but at different speeds. 
B) move away from each other at the same speed. 
C) move a short distance and then slow down. 
D) move a short distance and then go faster. 
E) come to a stop after a few minutes. 
A) move away from each other, but at different speeds. 
B) move away from each other at the same speed. 
C) move a short distance and then slow down. 
D) move a short distance and then go faster. 
E) come to a stop after a few minutes.

Question 19

A cannonball following a parabolic path explodes into fragments. The momentum of the fragments

Accepted Answer

A) continue along the path as if the explosion didn't occur. 
B) cancels to zero by vector addition. 
C) both of these 
D) neither of these 
A) continue along the path as if the explosion didn't occur. 
B) cancels to zero by vector addition. 
C) both of these 
D) neither of these

Question 20

Two vehicles with equal magnitudes of momentum traveling at right angles to each other undergo an inelastic collision. The combined wreck moves in a direction

Accepted Answer

A) parallel to either of the cars before collision. 
B) at 45 degrees to the direction of either car before collision. 
C) at some angle other than 45 degrees. 
A) parallel to either of the cars before collision. 
B) at 45 degrees to the direction of either car before collision. 
C) at some angle other than 45 degrees.

Exam 6: Momentum

A softer landing occurs when an falling object bounces from a surface

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

Recoil is noticeable if we throw a heavy ball while standing on roller skates. If instead we go through the motions of throwing the ball but hold onto it, our net recoil will be

A bungee jumper attains a speed of 30 m/s just as the bungee cord begins to stretch. If the period of stretch is 2 s while coming to a halt, the jumper's average deceleration is about

A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared with the force that stops the car, the force needed to stop the truck is

A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball that is initially at rest. Both move with a combined momentum of

The conservation of momentum is most closely related to

An open freight car rolls friction free along a horizontal track in a pouring rain that falls vertically. As water accumulates in the car, the car's speed

A 5-kg fish swimming at 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after lunch is

A karate chop is more effective if one's hand

A 5000-kg freight car moving at 2 m/s collides with a 10,000-kg freight car at rest. They couple upon collision and move away at

Padded dashboards in cars are safer in an accident than non-padded ones because passengers hitting the dashboard encounter

The greater efficiency achieved with the curved blades of a Pelton wheel is due to

A fan attached to an ice sailcraft stalled on a windless day blows air into the sail that bounces backward upon impact. The boat

A car traveling along the highway brakes to a stop over a certain distance. More braking force is required if the car has

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

A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. They collide and stick. The combined mass moves at

If a monkey floating in outer space throws his hat away, the hat and the monkey will both

A cannonball following a parabolic path explodes into fragments. The momentum of the fragments

Two vehicles with equal magnitudes of momentum traveling at right angles to each other undergo an inelastic collision. The combined wreck moves in a direction

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