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Conservation of Energy Notes

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Conservation of Energy Notes

1. 1. Use this diagram to answer the following questions. Assume the balls are rolling down the hill. At position “A” the balls are not moving. At position “B”, they are. 1. Where does the hollow, white ball have most KE? 2. Where does the hollow, white ball have the least KE? 3. Where does the solid, black ball have most KE? 4. Where does the solid, black ball have least KE? 5. Do the two balls at the top of the hill have the same amount of KE? 6. Do the two balls at the bottom of the hill have the same amount of KE? A B Surface of the Earth B A B A Yes, zero Joules No
2. 2. ReviewReview  Energy TransferEnergy Transfer  WorkWork  PowerPower
3. 3. EnergyEnergy TransformationTransformation Energy can beEnergy can be transformedtransformed from one form to anotherfrom one form to another The changing of energy fromThe changing of energy from one form to anotherone form to another But the total amount of energyBut the total amount of energy never changesnever changes
4. 4. The Law ofThe Law of Conservation ofConservation of EnergyEnergy Energy can not beEnergy can not be created or destroyedcreated or destroyed Just ChangedJust Changed
5. 5. The total energy before the car stops is equal to the total energy after the car stops
6. 6. Roller CoastersRoller Coasters  Max GPE is at the top ofMax GPE is at the top of the highest hillthe highest hill  GPE changes to KEGPE changes to KE  Max KE is where theMax KE is where the coaster is traveling thecoaster is traveling the fastestfastest
7. 7. Energy Chains Mechanical energy Electrical energy Mechanical energy Some of the mechanical energy is transformedinto heat energydue to friction Som e of the electrical energy is transform ed into heat energy due to friction Electrical generator generating electricity to make an electric motor spin a propeller