3) Define frictional force?
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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contac.
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the friction is a force that always opposes motion between two surfaces in contact with each other and depend on the nature of the surface in contact. that is known as friction force.....
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