Q18 of 49 Page 11

With an example explain the transformation of energy.

When we throw a ball, we transform the energy stored in our body into kinetic energy of the ball. When we lift the ball from the ground, we transform this energy into potential energy. If this ball is released from a height above the earth, the earth pulls it down, does work on it and the gravitational potential energy is transformed into kinetic energy. When the ball strikes the ground, the stored kinetic energy gets transformed into sound energy.

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16 Explain briefly elastic potential energy with an example? 17 A crane lifts a car upto a certain height in 1 minute. A second crane lifts the same car upto the same height in 2 minutes. Which crane supplies the greater power? Which crane consumes more fuel? 19 Explain the energy transformation of sun's radiation. 20 An artificial satellite orbiting the earth at an altitude of a few hundred kilometers loses a small amount of energy as heat due to friction of the thin atmosphere at that altitude. Why then does its speed increase progressively as it comes closer and closer to the earth?