what is 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 contact.
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Frictional force is a force applied by surface to the opposite side of the motion of body.
Frictional force is also known as Drag
when force is exert by fluid ( air , water).
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