Motion, When an object changes its position., force , A push or pull on an object., Work, When a force moves an object in the direction of the force., Friction, A force that slows down or stops motion between two surfaces thattouch (against motion), Balanced Forces, Opposing forces that cause no change in motion, Unbalanced Forces, A greater force that overcomes opposing force that cause a change in, Magnetism, A force that can pull (attract) or push (repel) certain materials like iron or steel., Attract, When magnets pull toward each other., Repel, When magnets push away from each other..

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