3. When a ball is thrown vertically upwards, the gravitational potential energy of the ball
a. increases.
b. decreases.
C. remains same.
d. none of these
C.
4. Which form of energy is possessed by a stretched spring?
a. chemical
b. elastic potential
muscular
d. heat
5. Which transformation of energy takes place in a door bell?
a. electrical energy into kinetic energy
b. electrical energy into sound energy
C. chemical energy into electrical energy
d. nuclear energy into light energy
Answers
Answer:
Answers
3. a. increases
4. b. elastic
5. b. electrical energy into sound energy
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Answer:
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Explanation:
According to the law of conservation of energy its kinetic energy is getting converted in to potential energy because of gain in height. So, if the velocity of a ball goes on decreasing when it is thrown vertically upwards. When its velocity becomes zero, its potential energy becomes maximum.
When a spring is coiled up or a rubber band is stretched, mechanical energy is stored in it. When the spring uncoils or the rubber band snaps back, this energy is released. This stored mechanical energy is called potential energy because it has the potential to make things happen.
Another household item, a doorbell uses electromagnetism to convert electrical energy, stored in a battery or power grid, into mechanical and then sound energy.