P1.1 - Energy changes in a system, and ways energy is stored before and after changes Halfway Review

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1) What is a system?

2) What is the law of conservation of energy?

3) When a system changes, what happens to the way energy is stored?

4) What is the net change in energy in a closed system? Give an example.

5) What energy changes are involved when an object is projected upwards?

6) What is the equation for elastic potential energy?

7) What equation links g.p.e., height, mass and gravitational field strength?

8) What equation is used to calculate kinetic energy of a moving object?

9) What is the equation for gravitational potential energy gained by an object raised above ground level?

10) In all system changes, what happens to energy?

11) What is the equation used to calculate energy efficiency?

12) What two ways can be used to reduce unwanted energy transfers?

13) (HT) How is the efficiency of an intended energy transfer increased?

14) What equation is used to calculate change in thermal energy?

15) How much energy is needed to increase the temperature of 500 g of lead from 20oC to 45oC? The specific heat capacity of lead is 128 J/kg oC.

16) What is meant by the term 'specific heat capacity'?

17) What is meant by the term 'power'?

18) How is the rate of a cooling building affected by the thickness and the thermal conductivity of it's walls?

19) What definition is illustrated in the following example: comparing two electric motors that both lift the same weight through the same height but one does it faster than the other?

20) What affect does a higher thermal conductivity have?on the rate of energy transfer?

21) What are the main energy resources available for use on Earth?

22) How is the main energy resource of fossil fuels used on Earth, compared with solar?

23) Why are fossil and nuclear fuels more reliable than wind for generating electricity?

24) What are the environmental issues that arise from the use of different energy resources?

25) What is a renewable energy resource?

26) Why has there been an increase in use of fossil fuels since the early 1900s and how does this compare with solar energy?

27) Which of the following energy resources are renewable and which are non-renewable: fossil fuels, wind, biofuel, solar, nuclear fuel, water waves?

28) What are the main uses of energy resources on Earth?

29) What are the energy resources available on earth?

30) What is the environmental impact of using fossil fuels compared with solar?

31) How do the Big Ideas link to this topic?