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प्रश्न
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उत्तर
P.E. is the energy possessed by a body by virtue of its position, shape or configuration but K.E. is the energy possessed by a body by virtue of its velocity or motion.
E.g. A ball kept on a cliff possesses P.E. but as soon as it is kicked it possesses K.E.
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संबंधित प्रश्न
The S.I. unit of energy is .............
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B does the same in 15 s. Compare the work done.
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
Each of the following statement describes a force acting. Which force is causing work to be done?
A boy pulls a box up to 10 m with a force of 5 kgf. Calculate the work done by him.
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.
