A heavy suitcase is carried by a porter a sizable horizontal distance. The work done on the suitcase by the porter
A) is zero.
B) is positive.
C) is negative.
D) depends on how heavy the suitcase is.
E) is unknown; more information is needed to work out the answer.

Question

Quizplus · Accepted Answer

The work done on the suitcase by the porter is considered zero because work is defined as the force applied in the direction of motion times the distance moved. Since the force applied by the porter is vertical (to lift or hold the suitcase against gravity) and the motion is horizontal, the angle between the force and the direction of motion is 90 degrees, leading to zero work done in the context of physics.

A Heavy Suitcase Is Carried by a Porter a Sizable