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AP® Physics C: Mechanics

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Conceptualizing Gravity on Two Different Masses

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The force of gravity on a $2\text{ kg}$ rock is twice as great as the force of gravity on a $1\text{ kg}$ rock.

Which of the following explains why the heavier rock does NOT fall faster?

A

Because the force of gravity exerted on the Earth by the rock is equal to the force of gravity exerted on the rock by the Earth.

B

Because for every action, there is an equal and opposite reaction.

C

The force of gravity is the same on both rocks, which is why they have the same acceleration.

D

Because the heavier rock has twice as much gravitational force acting on it, but also twice as much mass, leading to the same acceleration.

E

Because the forces are balanced, so even though the force of gravity is twice as large, it makes no difference on the rock's a​cceleration.