define friction?whst are the cause of friction
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friction:-
Explanation:
if we slide or try to slide a body over a surface, the motion is resisted by a bonding between the body and the surface. this resistance is called frictional force. the opposite force that comes into play when one body tends to move over the surface of another body but actually motion has yet not started is called static friction.the maximum value of the static friction force which comes into play when a body just begins to slide over the surface of another body is called limiting frictional force. when to what is actually role on each other the rolling friction comes into play. when a body moves over the other body then the force of friction acting between two surfaces in contact in a relative motion is called kinetic friction. advantages and disadvantages of friction. 1.walking is possible due to friction.2.,the transfer of motion from one part of a machine to other part through belts is possible by brakes works on the principle of friction.