A box sits on a horizontal wooden ramp. The coefficient of
static friction between the box and the ramp is 0.50. You grab one
end of the ramp and lift it up, keeping the other end of the ramp
on the ground.
a. What is the angle between the ramp and the horizontal
direction when the box begins to slide down the ramp?
b. Now that the box is sliding what is it's acceleration down
the ramp? The coefficient of kinetic friction is 0.30.