What does the law of conservation of momentum tell us about collisions?
a. Collisions increase the momenta of the colliding objects because the impacts add momentum.
b. Collisions decrease the momenta of the colliding objects because the friction of the impact decreases momentum.
c. The total momentum in the system does not change because of a collision.
d. The total momentum in the system goes to zero at the time of the collision.
e. The momentum of each colliding object goes to zero upon collision.
Question 2
If two identical balls have momenta that are equal in magnitude but opposite in direction, what do we know about the speeds of the two balls after the two collide?
a. The speeds of the two balls will always be the same.
b. The speeds of the two balls will always be different.
c. The speeds with both will be faster than before.
d. The ball that was hit first will move faster.
e. The ball that was hit first will move more slowly.
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