1. Forms of Energy & Energy Conversions

2. Forms of Energy Mechanical Energy: Related to motion of objects
Ex : moving machine parts
Windmill
Engine piston

3. Thermal Energy Related to heat
Thermal Energy = total KE and PE of all particles in an object
Particles in matter are constantly moving

4. Chemical Energy (type of potential energy)
Energy stored in chemical bonds within a substance
Ex: Gas, food, human body, battery

5. Elastic Energy (type of potential energy)
Energy stored in a compressed material
Example: rubber band, spring

6. Electrical Energy
Energy of Electric Charges

7. Electromagnetic Energy
Energy traveling in the form of waves
X-rays Visible light

8. Nuclear Energy Energy stored in nucleus of an atom
Nuclear Power plants convert nuclear energy to electricity

9. Energy conversions Law of conservation of energy:
Energy cannot be created or destroyed, only converted from one form to another

10. Impact crater in Arizona formed within past 20 yrs
Large KE of meteor converted to large amount
of thermal energy vaporizing everything in
Close proximity

11. Energy conversions
Light bulb : converts electrical into thermal and electromagnetic energy
Compressed Spring: converts potential to kinetic
Burning wood: stored chemical energy converted to thermal and electromagnetic

12. If friction is ignored total mechanical energy will remain constant
Energy Conversion
in a Pendulum
If friction is ignored total mechanical energy will remain constant
(KE + PE) start = (KE + PE)end
Pendulum would swing forever!!!

13. Viewing a Pendulum
Pendulum Energy Conversion