Question

4. How is the amount of work measured
(a) when the body moves in the direction of the force?
(b) when the body moves in the direction opposite to the force?
(c) when the body moves at an angle to the direction of the force?

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Answer 1

Answer:

i) Work done by a force when the force is in the direction of displacement

= Force × Displacement of the point of application of the force in the direction of force.

(ii) Work done by a force when the force is at an angle (θ) to the direction of displacement = Force × component of displacement in the direction of force.

= Force ×dcosθ

[d is the displacement of the body at the angle θ to the direction of force]

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