Physics Bridging Course

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Physics Bridging Course - Quiz #6

Please complete this quiz. Show the results screen to a demonstrator to receive Chapter 6 Answers if they are satisfied with your attempts at the tutorial questions/experiments.

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Question 1 - The momentum of a 225 g softball moving at 35 m/s is: *

1 point

3.5 N

7.9 kg.m/s

5 m/s

21 kg.m/s

Question 2 - A moving white hockey puck collides elastically with a stationary red hockey puck on a frictionless horizontal surface.

No net external force acts on the two-puck system.

Select all of the following statements that must be true for this elastic collision.

(1) The kinetic energy of the white puck is conserved (same before and after the collision).

(2) The linear momentum of the white puck is conserved.

(3) The linear momentum of the two-puck system is conserved.

1 point

(3) only

(1) and (2) only

(1) only

(1) and (3) only

(1), (2), and (3)

Question 3 - Consider the Newton's Cradle. If you were to release 2 ball bearings (instead of 1), what would happen on the other side? *

1 point

1 ball bearing moves on the other side to twice the height of the original

2 ball bearings move on the other side to the same height as the original

2 ball bearings move on the other side to twice the height of the original

Nothing

Question 4 - In an elastic collision between 2 objects of the same mass moving at the same speed on an air track. What happens to the two objects? *

1 point

After they collide the first object stops and the second rebounds with twice the speed

They collide and come to a rest

They bounce off each other with the same speed in the opposite direction

They bounce off each other with the half the original speed in the opposite direction

Question 5 - In any collision: *

1 point

Total momentum is not conserved but total kinetic energy is conserved.

Total momentum is not conserved.

Total kinetic energy is conserved.

Total momentum is conserved.

Total momentum and total kinetic energy are conserved and the masses are equal.

Question 6 - Which has momentum: a 5 kg fish swimming at 100 m/hr or a 25 kg fish at rest? *

1 point

The 5 kg fish

The 25 kg fish

Neither

Both

Question 7 - If the momentum of a ball is doubled, then the kinetic energy is: *

1 point

4 times larger.

More information is required.

2 times larger.

0.5 times larger.

Question 8 - A cannon fires a cannonball and recoils backward.

Which of the following statements is true about the cannon recoil? *

1 point

It happens because the momentum of the system is not conserved

It happens because the energy of the system is conserved

It happens because the energy of the system is increased

It happens because the momentum of the system is conserved

It happens because the momentum of the system is increased

Question 9 - A collision is an isolated event in which a relatively strong force acts on each of two or more colliding bodies for a relatively short ______________ *

1 point

Time

Force

Height

Distance

Question 10 - In order to reduce the "sting" in catching a hard ball one usually: *

1 point

Increases momentum change

Increases the impulse

Increases the contact force

Increases the contact time

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