Work and Energy Class 9 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? Bolu March 19, 2026 No Comments
Work and Energy Class 9 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? Bolu March 19, 2026 No Comments
Work and Energy Class 9 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 Bolu March 19, 2026 No Comments
Work and Energy Class 9 What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer. Bolu March 19, 2026 No Comments
Work and Energy Class 9 A certain Household has consumed 250 units of energy during a month. How much energy is this in Joules? Bolu March 19, 2026 No Comments
Work and Energy Class 9 Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going? Bolu March 19, 2026 No Comments
Work and Energy Class 9 What are the various energy transformations that occur when you are riding a bicycle? Bolu March 19, 2026 No Comments
Work and Energy Class 9 The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why? Bolu March 19, 2026 No Comments
Work and Energy Class 9 A mass of 10 kg is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer. Bolu March 19, 2026 No Comments
Work and Energy Class 9 Certain force acting on a 20 kg mass changes its velocity from 5 m s–1 to 2 m s–1. Calculate the work done by the force. Bolu March 19, 2026 No Comments
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