Question

which kind of friction is the least in solids and why ?

Answer 1

fluid friction is the kind of friction which is least in solids

Answer 2

Answer:

Rolling Friction

Rolling friction is lesser than the static friction. This is because the surface of contact is very small so the net normal force is also small. This is not enough to prevent body from sliding.  This friction comes into play when one body rolls over another body, for example, roller skates.