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- 1. Energy<br />
- 2. Whatisenergy?<br />Energyistheabilityto do work<br />Where do thefollowinggettheirsources of energyfrom?<br />A car<br />A person<br />Whatisthetype of worktheyboth do?<br />
- 3. Amount of Energyactivity<br />In yourgroups, orderthedifferentactivities in terms of howmuchenergythey use (3 minutes)<br />Energy to make the human heart beat once<br />Energy stored in 1 litre of petrol<br />Energy used by the human body for one day<br />Energy to lift up an apple by one metre<br />Energy stored in a peanut<br />Kinetic energy of a fast-moving cricket ball<br />Energy to drive a car 60 miles<br />Energy in 1 unit on your electricity bill (costs about 15p)<br />Energy a person uses to press a key on a computer keyboard<br />Energy from burning one whole match <br />Energy to boil 1 litre of water, starting from freezing point<br />Energy in a typical chocolate bar<br />Energy stored in one new AA battery<br />
- 4. Energy to drive a car 60 miles: 250,000,000 J<br />Energy stored in 1 litre of petrol: 34,000,000 J <br />Energy used by the human body for 1 day: 10,000,000 J<br />Energy in 1 unit on electricity bill (costs 15c): 3,600,000 J<br />Energy in a typical chocolate bar: 1,000,000 J<br />Energy to boil 1 l of water, from freezing: 500,000 J<br />Energy stored in a peanut: 25,000 J<br />Kinetic energy of a fast-moving cricket ball: 1000 J<br />Energy stored in one new AA battery: 1000 J<br />Energy from burning one whole match: 1000 J<br />Energy to lift up an apple by one metre: 1 J<br />Energy to make the human heart beat once: ½ J<br />Energy to press key on computer keyboard: 1/100 J<br />
- 5. Howisenergymeasured?<br />Theunit of energyisthejoule (J)<br />There are 1000J in a kilojoule (kJ)<br />Toconvertfrom J tokJ:<br />Divide by 1000<br />Example: 3500J = 3500kJ = 3.5 kJ<br /> 1000<br />ToconvertfromkJto J:<br />Multiplyby 1000<br />Example: 2.7kJ = 2.7 * 1000 = 2700J<br />
- 6. Convertingjoulestokilojoules<br />Copy and complete thefollowingtable:<br />
- 7. Convertingjoulestokilojoules<br />Copy and complete thefollowingtable:<br />
- 8. Forms of energy<br />There are 9 forms of energy:<br />HEAT<br />LIGHT<br />SOUND<br />ELECTRICAL<br />KINETIC (also called MOVEMENT)<br />ELASTIC POTENTIAL<br />GRAVITATIONAL POTENTIAL<br />NUCLEAR <br />CHEMICAL.<br />

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