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Which formula can be used to express the law of conservation of momentum, where p = momentum?

A
pi = pf
B
pi > pf
C
pi < pf
D
pi ≠ pf
2
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A bowling ball collides with a pin and pushes the pin toward the right. Which describes the reaction force?

A
The pin pushes the bowling ball toward the right.
B
The pin pushes the bowling ball toward the left.
C
The bowling ball pulls the pin toward the right.
D
The bowling ball pulls the pin toward the left.
3

Football helmets are made with padding that helps reduce head injuries when a player collides with an object. Which best explains how the padding reduces injuries?

A
It extends the time of the collision.
B
It reduces the time of the collision.
C
It eliminates the reaction force of the object.
D
It eliminates the action force of the object.

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