Question

positive and negative example of force

Answer 1

Positive Work

 If a force displaces the object in its direction, then the work done is positive.
The example of this kind of work done is motion of ball falling towards ground where displacement of ball is in the direction of force of gravity.

Negative work

If the force and the displacement are in opposite directions, then the work is said to be negative. For example if a ball is thrown in upwards direction, its displacement would be in upwards direction but the force due to earth’s gravity is in the downward direction.

Answer 2

Positive force: When the force and displacement are in the same direction (theta is equal to 0°) the work done by the force is positive.

Example: When a body moves on the horizontal surface, force and displacement act in the forward path.

Negative force: When the force and the displacement are in opposite directions (tetha is equal to 180°) the work done by the force is negative.

Example: In pulling a box of books along a rough floor at constant velocity, I do positive work on the box, that is I put energy into the system. The force of friction opposes the displacement (always), and does negative work.

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