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?
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?
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?
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?
A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.
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