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gravity


a force that pulls two objects toward each other

When you drop something, the force of gravity makes it fall downward.

  gravity

speed


how fast an object moves over time

A racecar gained speed over the first minute of the race.

  speed

momentum


motion of an object based on its speed and mass (amount of matter in an object)

A snowboarder gained momentum as she traveled down the mountain.

  momentum

friction


resistance to movement when two surfaces rub together

Friction is what stops a ball from rolling across rough grass.

friction
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