Answers

2016-07-01T20:46:05+08:00
The Force of Friction. Friction is a force that is created whenever two surfaces move or try to move across each other. Friction always opposes the motion or attempted motion of one surface across another surface.
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2016-07-01T20:46:15+08:00
By rubbing two insulators together that forms static charge through heat it produces.
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