# A block weighing 9 kg is on a plane with an incline of (7pi)/12 and friction coefficient of 1/3. How much force, if any, is necessary to keep the block from sliding down?

Feb 26, 2018

Technically you can't have an inclined with angle bigger than $\frac{\pi}{2}$ as the angle is measured from the base to the inclined plane. Otherwise, the weight will free fall; hence, the force to keep it from falling is ~88.3N. Or please change the angle.