Topic 3 Conservation of Energy

1 What is the unit for measuring energy?

2 What is the name for energy stored in a hot object?

3 How is energy transferred from hot objects to their surroundings?

4 Energy stored in petrol in a car is transferred to energy stored in the moving car. What are the names for these two energy stores?

5 If 100J of energy is transferred into a machine, how much is transferred out?

6 In what way is most wasted energy transferred?

7 When an object is moved to a higher position, what name is given to the energy that it then stores?

8 What are the energy transfers when a ball bounces?

9 What are the energy transfers when a moving car slows down?

10 Name three different types of object or substance that store energy in chemicals.

11 Name two ways in which a television transfers useful energy to its surroundings.

12 Name one way in which a television transfers wasted energy to its surroundings.

13 In what way do most machines or processes transfer wasted energy to the surroundings?

14 Name two machines in which energy transferred by heating is useful energy.

15 When a kettle boils water, the useful energy ends up stored as thermal energy in the hot water. Where does the wasted energy end up?

16 When a moving car brakes and comes to a stop, where does all the kinetic energy it was storing eventually end up?

17 When a moving car hits a wall, what happens to the kinetic energy it was originally storing?

18 What does dissipated mean?

19 Which wastes more energy: a more efficient machine or a less efficient machine?

20 What happens to the particles in a solid when the solid gets warmer?

21 One end of a metal bar is heated. What is the name for the way energy is transferred along the bar?

22 What kind of materials are good thermal conductors?

23 Name two materials that are good thermal insulators.

24 What is the name for the way in which energy is transferred in a fluid