1. Energy Transformations

2. Energy The ability to cause change

3. All forms of energy can be described in terms of two general types: 1. Kinetic Energy 2. Potential Energy

4. Kinetic – the energy of motion Example: car moving

5. Potential – stored energy that can be used at a later time Example: holding a soccer ball in your hands

6. Energy Transformations Chemical Mechanical Electrical Thermal (heat)

7. 1. Chemical Energy Potential energy stored in chemical bonds of compounds Energy is released when the bonds are broken

8. Examples of chemical energy If you strike the wood end of a match, nothing happens. If you strike the tip with the chemicals, the match will light.

9. Examples of chemical energy Hand warmers Glow sticks Injury packs Batteries

10. 2. Mechanical Energy Energy of an object that is moving

11. Examples of mechanical energy Gears Windmills Riding a bike Juggling Turbines

12. 3. Electrical Energy Energy of moving electrons

13. Examples of electrical energy Curling iron Toaster DVD player Refrigerator

14. 4.Thermal (heat) Energy Movement of molecules to create heat Energy flows from warmer to cooler objects.

15. Thermal (heat) Energy Conduction Convection Radiation

16. Conduction Transfer of energy through direct contact

17. Examples of conduction Burning your hand on the hot stove Pancake on the griddle Burning your feet on the pavement on a hot summer day

18. Convection Movement that transfers heat in a liquid or gas

19. Examples of convection Heating your house Cooking soup Lava lamp

20. Radiation Transfer of energy by light

21. Examples of radiation Sunbathing Heat from a bonfire Tanning booth

22. Law of Conservation Energy can neither be created or destroyed