Conservation of Energy

1. Conservation of Energy Section 4.2

2. SC Standards Covered • PS 6-1 Explain how the law of conservation of energy applies to the transformation of various forms of energy (including mechanical energy, electrical energy, chemical energy, light energy, sound energy, and thermal energy)

3. There are many different forms of energy. FormSourceUses To see; power source radiant sun, light bulb outlets, power plants electrical Power electrical devices chemical food, gasoline Power; energy for living things

4. Heat objects Thermal fire, sun Nucleus of atom Power plants Nuclear sound TV, radio, people Communication Mrs. Babb gives off lots of sound energy!

5. Energy can change forms! What energy transformations are taking place? Electrical to light / thermal Chemical to heat Chemical to light / sound

6. Kinetic to electrical Radiant to electrical Nuclear to electrical

8. Conversions between KE and PE • Mechanical energy – the total amount of kinetic and potential energy in a system • Falling objects – Gravitational potential energy is converted to kinetic energy • Figure 1.7 in your book

9. The Law of Conservation of Energy - energy cannot be created or destroyed; it can only change forms

11. Energy and The Human Body • We get our energy from the foods we eat (chemical potential energy) • We convert that energy to kinetic energy, sound energy, & thermal energy • The energy we get from foods is measured in calories • 1 Calorie = 1000 calories (kilocalories) • 1 C = 4,184J

13. Your Turn!!