Work and Energy Class 9Illustrate 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? By Quick Guide Team / March 19, 2026
Work and Energy Class 9An 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? By Quick Guide Team / March 19, 2026
Work and Energy Class 9A 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 By Quick Guide Team / March 19, 2026
Work and Energy Class 9What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer. By Quick Guide Team / March 19, 2026
Work and Energy Class 9A certain Household has consumed 250 units of energy during a month. How much energy is this in Joules? By Quick Guide Team / March 19, 2026
Work and Energy Class 9Does 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? By Quick Guide Team / March 19, 2026
Work and Energy Class 9What are the various energy transformations that occur when you are riding a bicycle? By Quick Guide Team / March 19, 2026
Work and Energy Class 9The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why? By Quick Guide Team / March 19, 2026
Work and Energy Class 9A 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. By Quick Guide Team / March 19, 2026
Work and Energy Class 9Certain 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. By Quick Guide Team / March 19, 2026
