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Category: Work and Energy

A freely falling object eventually stops on reaching the ground. What happened to its kinetic energy?

Class 9 Physics Work and Energy
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Find the energy in kW h consumed in 10 hours by four devices of power 500 W each.

Work and Energy Class 9 Physics
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Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?

Work and Energy Class 9 Physics
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In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.

Class 9 Physics Work and Energy
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Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?

Class 9 Physics Work and Energy
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An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?

Class 9 Physics Work and Energy
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An electric heater is rated 1500 W. How much energy does it use in 10 hours?

Class 9 Physics Work and Energy
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Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?

Work and Energy Class 9 Physics
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