A change in position over time, gravity, motion, force, friction, speed, distance, a push or a pull, motion, gravity, speed, friction, force, distance, A force that pulls objects to earth, force, interact, gravity, distance, speed, motion, force of one object rubbing against another, friction, interact, motion, speed, distance, force, to have an effect on something else, speed, interact, motion, gravity, distance, force, the amount of space between two objects, gravity, interact, distance, force, friction, speed, the distance traveled in an certain amount of time, force, speed, interact, distance, gravity, friction

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