A crate full of artichokes rests on a ramp that is inclined 10.0 above the horizontal. Give

Question:

A crate full of artichokes rests on a ramp that is inclined 10.0° above the horizontal. Give the direction of the normal force and the friction force acting on the crate in each of these situations.
(a) The crate is at rest.
(b) The crate is being pushed and is sliding up the ramp.
(c) The crate is being pushed and is sliding down the ramp.