1. A force is applied – pushing the block
Work, Force and Energy
A force is applied – pushing the block
The block has moved this distance – this is an indication of the work done

2. Car drives along long straight road
Work, Force and Energy
Car drives along long straight road
Petrol tank is supply of ______ to do work
Engine provides _____ making car move forward
Petrol tank now has less ______ as some of it has been used by the engine to provide the ______ and to do ______
Car has moved along the road so _______ has been done

4. Energy Transfer Diagrams

5. What does the word efficient mean?
This is the most efficient car I have for sale at my garage
What does the word efficient mean?
This new light bulb is 5 times more efficient than the old type!

6. Look at these two light bulbs and calculate the efficiency
Energy Saving Light Bulb
Energy in = 15 Joules.
Useful light energy = 10 Joules.
Wasted heat energy = 5 Joules
Cost – 3 Euros
Lifespan – 4000 hours
Filament Light Bulb
Energy in = 100 Joules.
Useful light energy = 10 Joules.
Wasted heat energy = 90 Joules
Cost – 1 Euro
Lifespan – 800 hours

7. Question
Describe why it is better to use energy saving light bulbs than filament light bulbs
Your answer should include:
What efficiency, wasted energy and useful energy are
Energy transfer diagrams (including an indication of what is useful and what is wasted)
Efficiency calculations
Lifespan and cost factors
Good use of English, spelling, punctuation and grammar

8. Sankey Diagrams
Draw a Sankey diagram to represent an appliance that produces 60 joules of useful heat energy from every 100 joules of chemical energy it receives, with 40 joules being lost as wasted light energy

9. Analysing Energy in Food
Procedure:
Set up the equipment as shown at the front.
Measure 100mL of water and put it in the can
Take the temperature of the water
Weigh an almond
As shown by your teacher, light the almond and use it to heat the can (in the fume cupboard)
When the almond has finished burning, take the temperature of the water again.
Tasks:
Draw a diagram of the apparatus you used
Calculate the temperature change
Divide the temperature change by the mass of the almond. This gives the temperature change for one gram of almonds.
Multiply your answer to part c by 100 to get the temperature change for 100 grams of almonds.
Take your answer to part d and multiply it by 4.18 and then by 100. This gives the energy in joules released by 100 grams of almonds
Divide your answer to part e by 1000 to convert it to kilojoules.
Compare your answer to the amount of energy on the packet and discuss why or why not they are different

10. What ingredients go into this sandwich?
Where do these ingredients come from?
As it is food, it contains energy for our bodies. But…where did the energy come from?

11. Questions Give 2 advantages of using coal
Give 1 disadvantage of using coal
Give 1 advantage of using oil
Give 2 disadvantages of using oil
Give 2 advantages of using gas
Give 2 disadvantages of using gas
Give 3 advantages of using nuclear
Give 3 disadvantages of using nuclear

14. The Digestive System
Organ
What it Does