Question

when work is said to be +ve ,-ve and zero​

Answer 1

Answer:

+ve

when force and displacement occurs in same direction

-ve

when force and displacement occurs in different or opposite direction

zero

when force and displacement perpendicular to each other or when force and displacement makes angle of 90° ((((( cos 90° = 0 ))))

Answer 2

Answer:

Please see above. And please adjust my handwriting

Explanation:

Work is said to be positive if the direction of displacement or distance is same as the direction of the force

Work is said to be negative when the direction of distance or displacement is opposite to the direction of the force

Work is zero when the force is perpendicular to the direction of distance or displacement.

Note: Work of an object in circular is always zero as the gravitation force will be perpendicular to the direction of distance or displacement.

Also frictional force is best example of negative work done.

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