motion - the process of an object moving, changing place, or changing position, reference point - a place or object used for comparison to determine if something is in motion, speed - the distance an object travels in one unit of time, velocity - the speed and direction of an object, force - a push or pull exerted on an object, net force - the combination of all the forces acting on an object, acceleration - the rate at which velocity changes, friction - the contact force that resists motion between two objects, gravity - a force that pulls objects towards each other, due to their masses, mass - the measure of the amount of matter in an object, weight - a measure of the force of gravity on an object, contact force - a force between objects that are touching, non-contact force - a force that can act at a distance,

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