A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of force. What should be the value of θ to get the: (i) Maximum positive work? (ii) Negative work
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8
Answer:
Work done on an object along a given direction of motion is equal to the force times the displacement times the cosine of the angle. No work is done along a direction of motion if the force is perpendicular.
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55
Answer:
Work done by a force W=FS cosθ
where θ is the angle between force F and displacement S.
Work done is maximum and positive when cosθ=1
⟹ θ=0 degrees
Thus displacement of the body must be in same direction as that of force to get the maximum positive work.
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