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Home » 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:(a) work done by friction on a body sliding down an inclined plane,(b) work done by an applied force on a body moving on a rough horizontal plane with uniform velocity
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:
(a) work done by friction on a body sliding down an inclined plane,
(b) work done by an applied force on a body moving on a rough horizontal plane with uniform velocity
CBSE | Class 11 | NCERT | Physics | Work, Energy, and Power
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:
(a) work done by friction on a body sliding down an inclined plane,
(b) work done by an applied force on a body moving on a rough horizontal plane with uniform velocity

(a) The direction of motion of the object is opposite the direction of the frictional force, as can be seen. As a result, the work completed is negative.

(b) The frictional force acting on an object moving in a rough horizontal plane is in the opposite direction as the motion. A uniform force is supplied to the object to maintain a uniform velocity. As a result, the object’s motion and the applied force are both in the same direction. As a result, the work completed is positive.

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