1. Energy

2. What types of energy are there?

3. Nuclear Fusion these we have talked about Fission Mechanical (Kinetic) Potential Gravity Springs Chemical Light Heat Electrical

4. Kinetic and Potential Energy From our study of Friction, what might kinetic energy mean? Energy of motion Large objects (meteors) Small objects (bullets, raindrops, marbles) Tiny objects (molecules, atoms) http://www.middleschoolchemistry.com/multimedia/chapter1/les son2 http://www.middleschoolchemistry.com/multimedia/chapter1/les son2 What variables might be in an equation to calculate kinetic energy? Mass, speed KE = ½ mv 2

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7. Kinetic and Potential Energy What might potential energy mean? Examples An object at the edge of a cliff A mass on a spring A stretched rubber band A can of gasoline (chemical potential energy) What do we have left when all of the potential energy is used up?

8. Kinetic and Potential Energy What might potential energy mean? Examples An object at the edge of a cliff A mass on a spring A stretched rubber band A can of gasoline (chemical potential energy)

9. Kinetic and Potential Energy What might potential energy mean? Examples An object at the edge of a cliff Mass, height, gravity A mass on a spring Stretch length, spring strength A stretched rubber band Stretch length, spring strength A can of gasoline (chemical potential energy) Volume, octane rating?

10. Potential Energy An object at the edge of a cliff Mass, height, gravity PE = mgh Where m is mass in kg (cm) g is 9.81m/sec 2 ( 981 cm/sec 2 ) h is the height in meters (cm)

11. Gravitational Potential Energy h PE = mgΔh

12. How could we measure the effect of potential energy? - Given a bunch of marbles or steel balls

13. Tomorrow we will run an experiment to measure the effect of Potential Energy - By dropping them into flour and looking at the craters

14. Andy Saulietis Craters are everywhere! The Moon LPL / UA NASA Apollo 17