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New Topic Can you compare your answers to yesterdays energy circus with answers from other groups. Who was correct?!? You have 5 minutes to do this.

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Presentation on theme: "New Topic Can you compare your answers to yesterdays energy circus with answers from other groups. Who was correct?!? You have 5 minutes to do this."— Presentation transcript:

1 New Topic Can you compare your answers to yesterdays energy circus with answers from other groups. Who was correct?!? You have 5 minutes to do this

2 Last lesson Types of energy Law of conservation of energy Energy flow diagrams

3 What is Energy? The capacity to do work Not a very good definition!

4 Types of energy Energy can take many forms;

5 Heat Unlucky dog

6 Light

7 Sound

8 Kinetic (movement)

9 Electric

10 Chemical

11 Gravitational potential

12 Elastic/strain

13 Nuclear

14 Types of Energy HeatChemical LightGravitational SoundElastic/strain KineticNuclear Electric

15 Types of Energy HeatChemical LightGravitational SoundElastic/strain KineticNuclear Electric Stored/potential

16 The Law of Conservation of Energy Energy can be changed (transformed) from one type to another, but it can never be made or destroyed.

17 This means that the total amount of energy in the Universe stays the same!

18 Energy Flow diagrams We can write energy flow diagrams to show the energy changes that occur in a given situation. For example, when a car brakes, its kinetic energy is transformed into heat energy in the brakes. Kineticheat

19 Todays lesson Measuring the energy content of two fuels You will move to the next experiment at the appropriate signal.

20 Gather round Mr Porter

21 Energy Content of two fuels FuelInitial mass (g) Final mass (g) Mass of fuel used (g) Initial temp of water (°C) Final temp of water (°C) Temp rise of water (°C) Energy released (J) Energy released per gram of fuel (J/g) Wax Ethanol Volume of water (cm 3 ) x 4.2 x temp rise Energy ÷ mass Then write three sentences saying what you have discovered, and suggesting two ways the experiment could be improved.


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