Question

explain why sliding friction is less then static friction

Answer 1

Friction comes into play when irregularities present in the surfaces of two objects in contact get interlocked with each other. In sliding, the time given for interlocking is very small. Hence, interlocking is not strong. Therefore, less force is required to overcome this interlocking. Because of this reason, sliding friction is less than static friction.
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Answer 2

sliding friction is less than static due to differences in value s of coefficients of friction THE DIFFERECE IS DUE TO THE INTERLOCKING WHICH TAKES PLACE WHEN THE BODY IS AT REST WHEN BODY STARTS TO MOVE INTERLOCKING THAT IS THE BONDS BREAK AMD HENCE IT BECOMES EASY FOR BODY TO MOVE AMD HERE COMES KINETIC FRICTION INTO EXISTENCE