Question

When is work zero ? A force of 40 N is applied to a body. If the line of action of the force
makes an angle of 45° with the direction of the displacement of the body, then calculate the
amount of work done, when the body is displaced by 2 m.​

Answer 1

Answer:

Work done is said to be zero in the following situations :

1. Force applied is zero but the body displaces ( natural state of motion )
2. Force is applied but the body does not displace
3. The value of cosθ would be 0 ie cos 90

Now to the question :

F = 40 N

θ = 45

S = 2 m

W = FScosθ

    = 40×2×cos 45°

    = 80×√2 / 2

    = 40√2    Nm

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Explanation: