1. CONSERVATION OF ENERGY
Energy can neither be created nor destroyed; it can only be transformed from one form to another.

2. If energy is not created or destroyed (only transformed), then where does the energy to…
Walk down the hall…
Ride a roller coaster’s route…
Drive down the road…
Come from???

3. WORK done by Hiker Chemical ENERGY
WORK done by Hiker
Chemical ENERGY

4. Chemical Potential ENERGY WORK done on Steam Turbine
Cherokee Coal Fired Power Plant
Chemical Potential ENERGY
WORK done on Steam Turbine

5. Gravitational Potential ENERGY
Hoover Dam, NV
Gravitational Potential ENERGY
Las Vegas, NV
WORK done by lights

6. 1 Liter of water has a mass of 1kg
1 Liter of water has a mass of 1kg. If the dam allows 20,000 gal/sec (1gal = 3.78L) to flow through, what is the max amount of electrical power this dam’s turbines can put off?
200 m

7. Chemical Potential ENERGY
Gas
Chemical Potential ENERGY
WORK done by Car

8. If gasoline has 1.32 x 108Joule/gal of potential energy… and the engine is 20% efficient, how much gas will it burn for the 1600kg car to climb a 100 m tall hill?
100 ft

9. If energy is not created or destroyed (only transformed), then where does it go when…
A car with KE stops?
A person eats food, climbs a mountain, and stops?
A light bulb transforms electrical energy to light/heat then...?

10. How much KE?... In what direction?
How much PE?
How much KE?... In what direction?

11. Why doesn’t it hit your face?
The total energy of a system must be conserved…
But energy can be converted to: sound, light, and eventually ALWAYS heat … and essentially is “lost”

12. "miniLab"
Place cup at known distance from ramp (you choose)… using what you already know plus the new energy/work stuff, calculate the height on the ramp you need to release a ball from to land it in the cup!
If you succeed you are done… if not, determine the amount of energy lost to friction, air resistance… even sound.