1. briefly explain why sliding friction is less than static friction.

Explanation:

No surface is perfectly smooth.  Everything has irregularities, like bumps and ridges.  Static friction is the friction between non-moving objects when their surfaces lock together.  When an object is sliding, its surface skips and jumps along the surface of the other object.  Because there's less locking between the surfaces, the sliding friction is less than the static friction.

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this