Conservation of Energy

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Presentation transcript:

Conservation of Energy Physical Science Ms. Pollock 2008-2009

Changing Forms of Energy Transforming electrical energy Light, thermal energy, sound from electricity Transforming chemical energy Fuel into motion Fuel into heat photosynthesis

Conversions Between Kinetic and Potential Energy Many activities conversions between kinetic and potential energy Mechanical energy – total amount of potential and kinetic energy in a sysmte Mechanical energy = potential energy + kinetic energy Result of position and motion Falling objects – apple falling from tree = potential to kinetic Projectile motion – bat hitting ball = high KE/low PE, low KE/high PE, high KE/low PE Swing – constant oscillation between KE and PE

Conversions Between Kinetic and Potential Energy

The Law of Conservation of Energy Energy changing from one form to another but total amount of energy always constant Law of conservation of energy – energy cannot be created or destroyed Universal principle for transfer of energy from one object to another

Is Energy Always Conserved? YES! Sometimes it is just hard to see. Friction Mass into energy Nuclear fission Human body Maintaining homeostasis Fat and vitamin storage Heart beat, digestion (automatic processes) Movement 1 food calorie (C) = 4,184 J 1 gram fat = 9 C 1 gram carbohydrate or protein = 4 C