Why does it take more force to move a heavy box up a ramp than to move the same box down the ramp? A. There is more friction on the bottom of the box when going up a ramp.
B. Gravity is pushing the box up the ramp at the same time you are pushing the box up the ramp.
C. When you push an object up a ramp, you are working against atmospheric pressure, which is pushing down.
D. When you push an object up a ramp, you are working against gravity, which pulls the box downward.