Question

why static friction is greater than sliding friction?

Answer 1

static friction is greater than sliding friction because interlocking of the irregularities in the two surfaces

Answer 2

Hello Mate!

When the block slides over other surface then its contact points does not get enough time to interlock properlp, this is how somewhat you find easier to move a block which is already in motion than to the object in rest. This is why sliding friction is slidly smaller than static friction.

Hope it helps☺!