1. Conservation of Energy
Physical Science
Ms. Pollock

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

3. 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

4. Conversions Between Kinetic and Potential Energy

5. 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

6. 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