Question

A verge of skidding on a rough inclined plane θ= θ=30° as shown in fig. 5.39 (a) find the value of the coefficient of static friction (b) After we increase ∅ further to allow the block to accelerate and then decrease ∅ again to the value ∅=∅°=20° to allow the block to move with constant speed, find the coefficient of the kinetic friction

Answer 1

a)

$$\mu_s=\tan{30}=0.577$$

b)

$$\mu_k=\tan{20}=0.364$$