Question
The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:
(c) work done by friction on a body sliding down an inclined plane
Solution
Negative quantity
The direction of the frictional force is opposite to the direction of motion. Therefore, the work done by the frictional force is negative in this case.
The direction of the frictional force is opposite to the direction of motion. Therefore, the work done by the frictional force is negative in this case.
