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Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
A vessel containing 50 kg of water is placed at a height 15 m above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? (g = 10 m s-2)
Each of the following statement describes a force acting. Which force is causing work to be done?
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.
How fast should a boy weighting 30 kg run so that his kinetic energy is 375 joule?
State the amount of work done by an object when it moves in a circular path for one complete rotation. Give a reason to justify your answer.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A donkey is carrying a load on its back.
