Question

A box weighing 20lb. is being pushed up an incline. If the angle of incline was 90° to the ground, what effort would be needed to push the mass?

I don't get how to get the effort if an angle was in the problem.

Answer 1

You are looking for the weight component down the plane, that is what you have to overcome to go up the incline.

Weird: 90 degrees is straight up.
Effort has to be the same as weight. 20lbs.