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Question Bank Work, Power and Energy 1. Define work. Ans. Work is said to be done, when a force or its component causes displacement in the direction of force. 2. State the conditions for doing work. Ans. (i) There must be a force or component of force acting on a body. (ii) The force or its component must produce displacement in its own direction. 3. State the mathematical expression for work when displacement is produced in its own direction. Ans. W = F S, where, W is the work done, F is the force applied and S is the displacement in the direction of force. 4. State the mathematical expression for work when the force acts at an angle to the direction of displacement of body. Ans. W = F cos S, where W is the work done, F cos is the component of force acting in the direction of displacement and S is the displacement of the body. 5. How is work done measured? Ans. Work done is measured as a product of force and the displacement caused by it in its own direction. Class-X 1 Question Bank
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