Question

Suppose a block with a mass of 8.00 kg is resting on a ramp. If the coefficient of static friction between the block and ramp is 0.500, what maximum angle can the ramp make with horizontal before the block starts to slip down?

Answer 1

The equation is quite easy, try to remember it:

$$\text{tan}\theta=\mu_s,\\ \theta=\text{arctan}\mu_s=26.6°.$$