1.

How is work done by a force measured when the force : (i) is in the direction of displacement. (ii) is at an angle to the direction of displacement.

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 × d cos θ 

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



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