Work done by gravity on a man moving on horizontal surface is neg… - Vidyadip

Question

Work done by gravity on a man moving on horizontal surface is negative. [True/ False]

✓

Answer

False.
Explanation:
The force exerted by gravity is downward so the block should move downward. but, here the block is moving horizontally so work is not done by gravity.
Mathematically,
W = F × D × cos
Where is the angle between force and displacement.
Here is 90 degree as direction of force and displacements of block are perpendicular to each other.
So,
W = F × D × Cos 90
= 0J

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