## Essential University Physics: Volume 1 (3rd Edition)

We know that the block will slide when the frictional force is less than the gravitational force pulling the object down the ramp. Thus, we find: $mgsin\theta=F_n\mu \\ mgsin\theta = mgcos\theta \mu \\ \theta = tan^{-1}(.63)=32.2^{\circ}$ We know the block will tip when the net torque is greater than zero. Thus, we find: $\frac{h}{4}mgcos\theta=\frac{h}{2}mgsin\theta \\ \theta = tan^{-1}(.5)=26.56^{\circ}$ The block will tip first.