Work and Energy Class 9In 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 By Quick Guide Team / March 19, 2026
Work and Energy Class 9A freely falling object eventually stops on reaching the ground. What happened to its kinetic energy? By Quick Guide Team / March 19, 2026
Work and Energy Class 9Find the energy in kWh consumed in 10 hours by four devices of power 500 W each. By Quick Guide Team / March 19, 2026
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