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A boy pushes a toy box 2.0 m along the floor by means of a force of 10 N directed downward at an angle of 60º to the horizontal. The work done by the boy is
W = F s cos θ = 10 × 2 cos 60° = 10 J.
A particle describe a horizontal circle of radius 0.5 m with uniform speed. The centripetal force acting is 10 N. The work done in describing a semicircle is
W = F s cos90° = zero
A vehicle is moving with a uniform velocity on a smooth horizontal road, then power delivered by its engine must be
Work done by a conservative force is positive if
The magnitude of work done by a force :