- acceleration
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the rate that an object speeds up or slows down
- force
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a push or a pull
- gravity
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a force between a mass and the earth
- magnitude
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size, quantity, number
- mathematician
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an expert in math
- physicist
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an expert in physics
- speed
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the distance an object travels over a given amount of time, the rate of motion of an object
- theory
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a belief or thought about a topic