Energy can neither be created nor destroyed. It can only be changed from one form to another.
The above principle is called the principle of conservation of energy. It means that when all forms of energy are taken into account, the total energy in the universe remains constant. The principle is also valid for an isolated, i.e., one on which no force acts from outside.
Examples:
1. When a ball is dropped from a height, its gravitational potential energy decreases, since its height decreases. It may seem that energy has been lost. But the ball gains speed, and hence, it acquires kinetic energy. Actually, as the ball falls its potential energy is gradually converted into kinetic energy.
According to the law of conservation of energy | |||
Right Option : B | |||
View Explanation |
Which of the following are correct : (a) When a ball is dropped from a height, its gravitational potential energy decreases. (b) When a ball is dropped from a height, its gravitational potential energy increases. (c) When we switch on an electric torch, the chemical energy stored in the batteries is converted into heat energy. | |||
Right Option : B | |||
View Explanation |
When a body falls, then its total energy.__________________. | |||
Right Option : D | |||
View Explanation |
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