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  • In case of negative work the angle between the force and displacement is (a) 0 (b) 45 (c) 90 (d ) 180

In case of negative work the angle between the force and displacement is

(a) 0^{\circ}    (b) 45^{\circ}      (c) 90^{\circ}      (d ) 180^{\circ}

Answers (1)

best_answer

Answer:  [D]

Solution.

Work done by any force is defined as:
W=Fd\cos \theta
This work done can be positive, negative or zero depending on the angle between force and displacement.
If the angle between them is acute, then work done will be positive because \cos \theta  will be positive.
If the angle between them is 90^{\circ}, then the work done will be zero.
If the angle between them is obtuse, then the work done will be negative.
W=Fd(\cos 180^{\circ})=-Fd
Hence, the correct answer is option D.

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