The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?
Q. (a) The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?
(b) An object is dropped from a height h. When is its (i) potential energy maximum? (ii) kinetic energy maximum ?
Ans. (a) No, the total energy of the body is conserved as when a body falls down, its height from the ground decreases and hence its potential energy also decreases. Its velocity and kinetic energy increases. As a result, the decrease in the potential energy of a falling body appears as the gain in the kinetic energy of the body. The sum of the potential energy and kinetic energy of a falling body at any instant of time remains same.
(b) (i) Potential energy is maximum at height h.
(ii) Kinetic energy is maximum at ground level.
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