A crate of mass 20 kg is sliding across a wooden floor. The coefficient of kinetic friction between the crate and the floor is 0.3.
Determine the magnitude of the friction force acting on the crate.

Explanation

`(a)f_(s"max")=1.3xx10^(2)N, (n)` The block, which is initially at rest, stays at rest since `F lt f_(s "max")` Thus, it does not move , (c) `f_(x)=1.1xx10^(2) N, (d) f_(2"min")=46 N, (e) F_(2 "min")=17 N`