Question

A 24kg block is initially at rest on a horizontal surface. A horizontal force of 77N is required to set the block in motion, after which A horizontal force of 65N Is required to keep the block moving with constant speed. Determine the coefficient of static friction.

Answer 1

$$\mu_s=\frac{77}{24(9.8)}=0.33\\\mu_k=\frac{65}{24(9.8)}=0.28\\$$