Question

A body rests on a rough horizontal plane. A force is applied to the body directly towards the plane at an angle $\theta$ with the vertical. The body can be moved along the plane only if the value of angle $\theta$ is:

• A. ${45}^{\circ }$
• B. $>{45}^{\circ }$
• C. $>$ limiting angle of friction
• D. $<$ limiting angle of friction

Answer 1

The correct option is C $>$ limiting angle of friction

The body will not start to move until the friction reaching to the limiting point. Thus the body will move when the angle $\theta$ is greater than limiting angle of friction.