Energy and Change
Sources of Energy
Renewable and Non-Renewable Sources of Energy
Work- Pull or Push thins to make it move
Energy is needed to make everything work
You push a ball, you are giving energy to make the ball move
Sources of energy
Sources of energy has energy stored
Sun has stored energy, changed into heat and light
Non-Renewable energy can't be replenished
Eg. Coal, Crude Oil, Petroleum, Uranium
Renewable energy can be replenished
Eg. Wind, Solar, Water, Biofuel
Wind- Uses wind to turn a turbine... starts a generator
Water- Water falling turns a turbine... starts a generator
Solar- Sunlight shines on solar panels... goes to battery and provides energy
Bio Fuel- Suns energy is stored in plants... Sugar cane can be turned into alcohol and used as fuels...
Fast growing trees... Wooden chips are heated at high temp... turns into tarry liquid.. makes gas ten burned to make electricity
Potential and Kinetic Energy
Elastic Potential Energy
Eg. Stretch a Elastic band...
Position Potential Energy
Not on floor... Falls from something
Chemical Potential Energy
Eg. Wood burning needs... called chemical reaction
Law of Conservation of Energy
Energy cannot be created
Energy cannot be destroyed
Energy can only be changed from one form to another
Heat transfer
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Heat can... hotter objects to cooler ones
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