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1. Think of 2 ways to give energy to a doll that walks. (lesson 3a).

2. Where would the dolls in question 1 get the energy needed to move? (3a).

3. Name 3 examples of stored (potential) energy. (3b)

4. Give another name for movement energy. (3b)

5. The battery in a torch stores 100joules of energy and 30 joules are out as light. How much energy is wasted as heat? (3b)

6. What are the energy transfers when a stone is fired form a catapult? (3a, 3b).

7. What does KJ stand for? How many joule are there is 1kj? (3c)

8. What is the 'fuel' our bodies run on? (3c)

9. Which of the following foods has the most energy in an average portion? carrots, sausages, bananas, eggs. (3d)

10. What can affect the amount of a energy a person needs? (3d)

11. What happens if you take in more energy than you use up? (3d)

12. Name 3 fuels that can be used to to heat homes. (3e)

13. What is the difference between a renewable and a non-renewable source of energy? (3e)

14. Explain why fossil fuels are non renewable. (3e)

15. Name 3 renewable energy sources. (3e)

ANSWERS

1. Clockwork (wind-up), electric or battery.
2. From the energy stored in the body if it is a clockwork toy. From the energy stored in the battery if it is electrical.
3. Chemical energy, strain energy and gravitational energy.
4. Kinetic energy.
5. 70 joules.
6. Energy stored in your body --> energy stored in the elastic --> movement energy.
7. Kilojoule. 1000joules.
8. The food we eat.
9. Sausages.
10. A persons size, how active they are and how much they a re growing.
11. The energy is stored as fat (chemical energy).
12. Coal, gas, oil, paraffin, wood.
13. Once used up they can't be replaced.
14. They took millions of years to form, so once used they are gone forever.
15. Wind, waves, tidal, geothermal, biomass, solar, hydroelectric.