A box is to be moved across a level surface.A force of magnitude 200 N may be applied at an angle of 30° below the horizontal to push the box or at an angle of 30° above the horizontal to pull the box,either application sufficient to overcome friction and move the box.Which application will cause the box to have the greater acceleration?
A)the one below the horizontal
B)the one above the horizontal
C)both give equal acceleration
D)more information is needed

Question

Quizplus · Accepted Answer

The force above the horizontal will have a greater horizontal component than the force below the horizontal, since the angle in the former is closer to the horizontal. The horizontal component of the force is what contributes to the acceleration of the box, and thus the force above the horizontal will result in a greater acceleration.

A Box Is to Be Moved Across a Level Surface