Concepts Of Physics MCQ Edition [Volume 1]PhysicsWork and Energy

A box is pushed a distance of 4.0 m across a floor which offers a resistance of 100 N . What is the work done by the resisting force?

Options

A-25 J
B400 J
C25 J
D-400 J

Correct answer

D. -400 J

Step-by-step solution

Work done is given by the dot product of force and displacement vectors, W = F d = F d ( ) . The resisting force acts in the direction opposite to the displacement, so the angle between them is = 180^ . Given F = 100 N and d = 4.0 m . W = 100 4.0 (180^ ) W = 400 (-1) = -400 J

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