non-contact force - a force that acts at a distance, force - a push or pull that acts on an object, gravity - the force of attraction between any two objects, contact force - a force that requires two pieces of matter to touch, inertia - the tendency of an object to resist any change in motion, acceleration - the rate at which the speed or direction of motion of an object changes over time, friction - the force that results when two materials rub against each other or when their contact prevents sliding,

Chapter 5 Forces & Motion

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