1. Which of the following is/are the best example(s) of elastic collision(s)? A. A collision between two billiard balls.

B. A basketball bouncing off the floor.

C. A collision between two automobiles.

D. An egg colliding with a brick wall.

2. In an inelastic collision, kinetic energy is not conserved. Where does it go? (select all that apply)

A. It is transformed into heat.

B. It is transformed into momentum such that momentum is conserved.

C. It is transformed into gravitational potential energy.

D. It is used to deform the colliding objects.

3. If I were to drop an egg off a cliff, it begins to accelerate toward the ground, until it hits the ground and splattered. Is momentum conserved in this situation?

A. Yes. The speed of the egg is zero both before and after the fall, so momentum did not change.

B. No. Momentum is never conserved.

C. Yes. The earth is also pulled toward the egg, keeping the momentum constant during the whole fall.

D. No. The speed of the egg changes throughout the situation, but there is nothing else in the scenario that also moves to keep momentum conserved.