A block of mass rests on a horizontal surface for which the coefficients of friction…

PHYSICS · Multi-part · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics

Problem

A block of mass

4\,\text{kg}

rests on a horizontal surface for which the coefficients of friction are

\mu_s=0.50

and

\mu_k=0.30

. A horizontal force

F

is applied to the block. (a) Calculate the value of the limiting friction acting on the block. (b) If

F=16\,\text{N}

, state whether the block will move. Find the magnitude and direction of the frictional force in this case. (c) If

F=25\,\text{N}

, determine the acceleration of the block after motion starts.