Question

A 24-N horizontal force is applied to a 40-N block initially at rest on a rough horizontal

surface. If the coefficients of friction are µs = 0 .5 and µk = 0 .4, find the magnitude of the

frictional force on the block

Answer 1

Frictional force is

$Ff = µk \times mg$

$Ff = µk \times (F) \\ Ff =0.4 \times (40) \\ Ff =16 m$