Question

What should be the value of the angle between force displacement so that the work done by the force is :

(i) Zero
(ii) Maximum and positive? What is the sign of work done by a frictional force?



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Answer 1

Answer:

Since the force vector is directly opposite the displacement vector, theta is 180 degrees. The cosine(180 degrees) is -1 and so a negative value results for the amount of work done upon the object. aisa nao tumar uttor