Question

The net work done by kinetic friction is: A) Always negative B) Always zero C) May be negative or positive D) Always positive

Answer 1

option A. (Always Negative)

Step-by-step explanation:

Kinetic friction acts in the direction opposite to the relative motion between two objects, which means it opposes the motion. When you do work against kinetic friction (e.g., pushing an object on a rough surface), you are expending energy, and this energy is converted into heat due to friction. Since work is done against the direction of motion, the work done by kinetic friction is always negative.