Unit 6 - Momentum Test

Conservation of momentum is associated with which one of Newton’s Laws of Motion?

a. 1st Law

b. 2nd Law

c. 3rd Law

c. 3rd Law

A 1kg ball of putty moving at 1m/s collides with and sticks to a 5kg bowling ball initially at rest. The bowling ball and the putty then move with a momentum of

a. 0 kg m/s

b. 1 kg m/s

c. 2 kg m/s

d. 5 kg m/s

b. 1 kg m/s

Two billiard balls of identical mass roll towards each other (head on), what is their combined momentum after they meet?

a. 0

b. Half the sum of their original momentums.

c. Double the sum of their original momentums.

d. Cannot determine without more information.

d. Cannot determine without more information.

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

a. Zero

b. The same as before.

c. Small but noticeable.

a. Zero

An astronaut is working on the Hubble space telescope. The astronaut pushes off of the telescope with his feet, which of the following is true?

a. The astronaut and telescope will move away from each other at the same speed.

b. The astronaut and the telescope will move away from each other at different speeds.

c. Only the astronaut will move and the ship will stay stationary.

d. The astronaut will stay stationary and the telescope will move away at a constant speed.

b. The astronaut and the telescope will move away from each other at different speeds.

Kinetic energy is conserved in elastic collisions. (True or False)

True

Two train cars are moving towards each other. One is moving east and the other is moving west. They collide, hook together, and move off in the eastward direction. Is this an elastic or inelastic collision?

Inelastic Collision

In a collision between a light hydrogen molecule and a heavy water molecule, the momentum lost by one molecule is exactly the same as the momentum gained by the other molecule. (True or False)

True

Compared to the recoiling rifle the bullet has

a. Greater Speed

b. Greater Momentum

c. Greater Kinetic Energy

d. A and C

d. A and C