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# Energy

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Year 10 Energy - For additional resources visit: http://www.iheartscience.net

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### Energy

1. 1. Energy Sarah Jones http://fabianoefner.com
2. 2. http://fabianoefner.com
3. 3. Work • When a force (Newton, N) moves an object work is done. • Work is a measure of the amount of energy (Joules, J) used in moving the object. work done = force applied x distance moved W = F x d http://www.bbc.co.uk/bitesize/
4. 4. Force Diagrams
5. 5. • Thrust – a forward push • Upthrust – the upwards force on a body in a liquid or a gas
6. 6. Power • Power (Watts, W) is the rate that work is done – how fast energy is used. http://www.bestwallpaperphoto.com
7. 7. Kinetic Energy • The energy of motion. • All moving things have kinetic energy. painincorporated.com
8. 8. Calculating kinetic energy Ek = ½mv2 m = mass of object (kg) v = the objects speed (m/s) www.cyberphysics.co.uk
9. 9. Potential Energy • An object can store energy – this is dependent on position. • Includes - gravitational, chemical and elastic energy. www.physicsclassroom.com
10. 10. Electrical Energy Kinetic Energy
11. 11. Kinetic Energy Electrical Energy
12. 12. Electrical Energy Sound Energy
13. 13. Electrical Energy Heat Energy
14. 14. Light Energy Electrical Energy
15. 15. Elastic Energy Kinetic Energy
16. 16. Chemical Energy Heat Energy
17. 17. Gravitational Energy Electrical Energy
18. 18. Gravitational Energy Kinetic Energy
19. 19. Gravitational Potential Energy Ep = mgh m = mass (kg) g = acceleration due to gravity (9.8 m/s2) h = height (m) http://www.bbc.co.uk/schools/gcsebitesize
20. 20. Law of Conservation of Energy • States that energy cannot be created or destroyed, just transformed from one form to another. – Therefore, energy never ‘disappears’. – Energy that is transferred to unwanted forms is wasted energy.
21. 21. Et = Ep + Ek www.physicsclassroom.com
22. 22. Energy Conversion Efficiency • Some energy can be ‘lost’ as heat and sound. • Energy is lost in the form of heat and sound each time the rollercoaster moves. If this did not occur the rollercoaster would keep on moving forever.
23. 23. Television Electrical Light, Sound and Heat
24. 24. Stereo Electrical Sound and Heat
25. 25. Car Engine Chemical Kinetic, Sound and Heat
26. 26. Energy Transfers - Boardworks Light Bulbs Electrical Energy Light and Heat