Two equal forces are applied to a door. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force exerts the greater torque?
A)the first at the midpoint
B)the second at the doorknob
C)both exert equal non-zero torques
D)both exert zero torques
E)additional information is needed

Question

Quizplus · Accepted Answer

Torque is calculated as the product of force and the distance from the pivot point. Since the force applied at the doorknob is farther from the pivot (hinges) than the force applied at the midpoint, it exerts a greater torque.

Two Equal Forces Are Applied to a Door