1. Energy

Question 1

1. List the 8 energy stores?

Answer 1

1.Thermal, Kinetic, Gravitational Potential, Elastic potential, Chemical, Magnetic, Electrostatic, Nuclear

Question 2

2. What are the pathways that energy can be transferred by?

Answer 2

2. Heating, Work done by an electric current, work done by a force

Question 3

3. What are the units for velocity?

Answer 3

3. m/s

Question 4

4. What are the units for mass?

Answer 4

4. kg (kilograms)

Question 5

5. What are the units for energy?

Answer 5

5. J (Joules)

Question 6

6. When will an object have no energy in its kinetic energy store?

Answer 6

6. When it is not moving

Question 7

7. When is energy transferred to the gravitational potential energy store?

Answer 7

7. When an object is lifted up (through a gravitational field)

Question 8

8. What is the value for gravity on Earth?

Answer 8

8. 9.8 (unless they tell you to use a different number for gravity!)

Question 9

9. What is the unit for height?

Answer 9

9. m (metres)

Question 10

10.When is energy transferred to the elastic potential store?

Answer 10

10. When an object is stretched or squashed

Question 11

12.What is specific heat capacity?

Answer 11

12. Then energy needed to increase the temperature of 1kg of a material by 1⁰C

Question 12

13.Specific heat capacity of oil is 2100 J/kg/⁰C. How much energy is needed to raise the temperature of 1kg of oil by 1⁰C?

Answer 12

13. 2100J

Question 13

14.What is power? What is the unit for Power?

Answer 13

14. Rate of energy transfer, Watts (W)

Question 14

15.What are the units for work done?

Answer 14

15. Joules (J) – work done = energy transferred

Question 15

16.Why is a system not 100% efficient?

Answer 15

16. Some energy is always wasted

Question 16

17.In a light bulb, 25J of energy is supplied. 5J are usefully transferred into light energy. What is the efficiency of the bulb?

Answer 16

17. 5/25 = 0.2 x100 = 20%

Question 17

18.What happens to waste energy?

Answer 17

18. Dissipated as heat (spreads out and becomes less useful)

Question 18

19.Give three examples of insulation that can be used in the house.

Answer 18

19. Cavity wall insulation, loft insulation, double glazing

Question 19

20.What different ways we can get energy (energy resources)?

Answer 19

20. Coal, oil, gas, nuclear, wind, hydro-electricity, solar, bio-fuel, tides, geothermal

Question 20

21.What is a renewable resource?

Answer 20

21. One that won’t run out - we can replace as fast as we use it.

Question 21

22.What is finite resource?

Answer 21

22. One that will run out (non-renewable)

Question 22

23.Name 3 fossil fuels.

Answer 22

23. Coal, oil, gas

Question 23

24.What are the advantages and disadvantages of a nuclear power station?

Answer 23

24. Adv - cheap source of energy, get a lot of energy, reliable
    Disadv - finite, nuclear waste is dangerous, expensive to decommission