Answers

2015-09-29T16:13:15+05:30
Nitially it requires more force to break the interlock between the irregularities of two surfaces. But once the block is in motion, it takes time to interlock between the irregularities of two surfaces. Also, the body gains the inertia of motion. So, the dynamic friction(also known as kinetic friction) is less than limiting friction.
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2015-09-29T23:23:48+05:30
A GREAT FORCE IS REQUIRED TO OVERCOME THE  INTERLOCKING OF THE IRREGULARITIES .WHEN IT STARTS  MOVING DUE TO INERTIA LESSER FORCE WILL BE REQUIRED TO MOVE.THERE FORE DYNAMIC FRICTION IS LESS THAN KINETIC FRICTION
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