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ICSE Class X Notes 2021 : Physics : Work, Power, energy

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Selina Solutions Concise Physics Class 10 Chapter 2 Work, Energy and Power Exercise 2(A) page no: 27 Question: 1 Define work. When is work said to be done by a force? Solutions: When the force applied on a body makes the body move, then the work is said to be done. It is a scalar quantity. Question: 2 How is the work done by a force measured when (i) force is in direction of displacement, (ii) force is at an angle to the direction of displacement? Solutions: (i) Work done when force is in direction of displacement, W=F S (ii) Work done when force is at an angle to the direction of displacement, W = F S cos Question: 3 A force F acts on a body and displaces it by a distance S in a direction at an angle with the direction of force. (a) Write the expression for the work done by the force. (b) What should be the angle between force and displacement so that the work done is (i) zero, (ii) maximum? Solutions: (a) Work done when force is at an angle to the direction of displacement, W = F S cos (b) (i) The angle between force and displacement should be 900 as cos 900 = 0 for zero work done. W = F S cos 900 = FS 0 (ii) The angle between force and displacement should be 00 as cos 00 = 1 for maximum work done. Then, W = FS cos 00 = FS Question: 4 A body is acted upon by a force. State two conditions when the work done is zero.

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