Question

State the energy changes which takes place when:

1. A body released from rest from the top of a building.

2. A body thrown vertically upwards from the ground.

3. In a heat engine.

4. A bulb glows, when torch light is switched on.

5. A car moves up a hill.

6. A toy car spring is wound and car is made to run on level floor.

7. Water stored in dams rotates turbine connected to a dynamo.

8. An air gun is loaded and then fired.

9. A magnesium ribbon burns in air.

10. A stone projected vertically upwards, returns back to the thrower.

11. Water freezes in the freezing chamber of a fridge.

12. Photographic film is exposed to sunlight.

13. Food is digested by animals.

14. During electrolysis.

15. Burning of coal.

16. Petrol engine of a running motor car.​

Answer 1

Answer:

State the energy changes which takes place when:

1. A body released from rest from the top of a building.

2. A body thrown vertically upwards from the ground.

3. In a heat engine.

4. A bulb glows, when torch light is switched on.

5. A car moves up a hill.

6. A toy car spring is wound and car is made to run on level floor.

7. Water stored in dams rotates turbine connected to a dynamo.

8. An air gun is loaded and then fired.

9. A magnesium ribbon burns in air.

10. A stone projected vertically upwards, returns back to the thrower.

Answer 2

Answer:

The electrical energy changes into heat energy and light energy