1. Energy (chapter 5) Energy – the ability to do work Electrical, thermal, chemical, etc.

2. Kinetic energy – energy of motion KE = ½ mass x velocity 2 The label is the kg m 2 /s 2 …or the Joule (J) How does friction affect KE?

3. Gravitational Potential Energy Energy stored by objects due to their position above Earth’s surface GPE = mgh g = 9.8m/s 2 Let’s look at the connection between GPE and KE…

4. Potential energy Stored energy or energy of position Elastic PE – energy that can be stored in something that can be stretched or compressed Chemical PE – energy stored in chemical bonds

5. Law of Conservation of Energy Energy is neither created nor destroyed, but transformed! Light bulb (electrical  light) Mechanical energy = PE + KE

6. Nuclear reactions Fusion – the combining of 2 hydrogen nuclei Fission – splitting one atom into 2!