Column A Column B 1. Work done a. sound energy 2. Simple pendulum b. capacity to do work 3. Coiled spring in a watch c. transformation of energy 4. Vibrating bodies d. force × displacement 5. Energy e. elastic potential energy

1. Work done - d. force × displacement Work is said to be done when a force is applied on an object, and the object gets displaced under the action of that force, in the direction of the force. 2. Simple pendulum - c. Transformation of energy Energy is continuously converted from potential energy to kinetic energy and vice versa in a swinging pendulum. 3. Coiled spring in a watch - e. Elastic potential energy. Elastic potential energy is the energy that gets stored in a body when the body is stretched, compressed or bent. A wound up watch spring has potential energy because of wound up state of its coils. As the spring unwinds itself, it does work to move the arms of the watch. 4. Vibrating bodies - a. Sound energy Sound energy is produced by vibrating bodies. It is a form of kinetic energy. When an object vibrates (and makes sound), then the surrounding air also starts vibrating in exactly the same way and carries sound to our ears through the vibrations of its molecules. 5. Energy - b. Capacity to do work Energy is defined as the ability to do work. The SI unit of energy is Joule. Column A Column B 1. Work done d. force × displacement 2. Simple pendulum c. transformation of energy 3. Coiled spring in a watch e. elastic potential energy 4. Vibrating bodies a. Sound energy 5. Energy b. capacity to do work

E M B I B E

Living Science Physics 8>Chapter 4 - Energy>Exercises>Q B

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The kinetic energy of an object of mass $10 kg$ is (lesser/greater) than that of an object of mass $2 kg$ , if both are moving with the same velocity.

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Important Questions on Energy

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Living Science Physics 8>Chapter 4 - Energy>Exercises>Q B

The potential energy of raindrops _____ (increases/decreases) when they fall down.

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Living Science Physics 8>Chapter 4 - Energy>Exercises>Q B

Power is _____(smaller/greater) if more work is done in less interval of time.

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Living Science Physics 8>Chapter 4 - Energy>Exercises>Q C

Column A	Column B
1. Work done	a. sound energy
2. Simple pendulum	b. capacity to do work
3. Coiled spring in a watch	c. transformation of energy
4. Vibrating bodies	d. force $\times$ displacement
5. Energy	e. elastic potential energy