Suppose you are helping take groceries inside your house and you carry a heavy bag from the car to the house, keeping the bag at a constant level and walking at a constant speed. During your trip the work you do on the bag is
A) positive
B) 0
C) negative
D) equal to its potential energy

Question

Quizplus · Accepted Answer

When you carry a heavy bag at a constant level and speed, you are not doing work on the bag in the physics sense, because work is defined as force applied over a distance in the direction of the force. Since the force you apply is upward to counteract gravity, and you move horizontally, the work done on the bag is 0.

Suppose You Are Helping Take Groceries Inside Your House and You