Question

2. In case of negative work the angle between the force and displacement is *
(a) oº
(b) 45°
(C) 90°
(d) 180°​

Answer 1

Answer:

The answer was the c one

Answer 2

Answer:

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(d 180°​

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Step-by-step explanation:

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(a)Work done W = F.d cos 0

∴Work done at θ= 0°, W = F.d cos 0°                         (∴cos0° = 1)

⇒   W = F.d

For angle θ = 0°,

Work done Is positive, so it is not true.

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(b) We know that work done, W = F .d cos 0

For angle 0 = 45°,

work done is positive, so it is not true.

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(c) We know that work done, W = d cos θ

Work done at θ = 90°,      W = F.d cos 90°                                      (∴cos 90° = 0)

W = 0

So, it is not true.

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(d) Work done at θ = 180°, W = F.d cosθ (∴ cos 180°= -1)

W = - F. d

For negative work, the angle between the force and displacement should be 180°. (/.e„ force and displacement are antiparallel to each other) So, it is true.

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