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Work

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Question

Write an expression for the work done when a force is acting on an object in the direction of its displacement.

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Solution

When a force F displaces a body through a distance S in the direction of the applied force, then the work done W on the body is given by the expression:

Work done = Force × Displacement

W = F × s

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Q. Question 2
Write an expression for the work done when a force is acting on an object in the direction of its displacement.

F

acts on a body and displaces it by a distance

S

in a direction at an angle

θ

with the direction of force. Write the expression for the work done by the force.

Q. A force of 7 N acts on an object. The displacement is 8 m, in the direction of the force. Consider force acting on the object through the displacement. What is the work done in this case ?

A force F acts on a body and displaces it by a distance S in a direction at an angle $θ$ with the direction of force.

(a) Write the expression for the work done by the force.

(b) What should be the angle between the force and displacement to get (i) zero, (ii) maximum, work?

2 N

acts on an object. The displacement is say

8 m

in the direction of the force (Fig.

11.3

). Let us take it that the force acts on the object through the displacement. What is the work done in this case?

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