# 2 EnergyConservation Transformation

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```					  CONSERVATION
OF ENERGY
Energy can neither be created
nor destroyed;
it can only be transformed
from one form to another.
If energy is not created or destroyed (only transformed), then
where does the energy to…
1. Walk down the hall…

2. Ride a roller coaster’s route…

Come from???
http://www.woodsfamilyclimbs.com/albums/album16/980800_030_Approa
ching_the_Diamond_of_Longs_Peak.jpg
http://www.vikingrange.com/recipes/recipe_images/banana_pancakes_large.jpg

Chemical ENERGY                                                                  WORK done
by Hiker
Cherokee Coal Fired Power Plant

Chemical
Potential
ENERGY

http://www.industcards.com/cherokee-co.jpg

WORK done on
Steam Turbine

http://members.shaw.ca/onefishy/engine_room/steam%20turbine%20rotor.02.jpg
Hoover Dam, NV

Gravitational
Potential ENERGY

http://www.bierstall.de/images/Hoover%20Dam%202.jpg
Las Vegas, NV

WORK
done by
lights
http://www.ap.org/westwire/Vegas.jpg
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
http://us1.webpublications.com.au/static/images/articles/i10/1066_10mg.jpg

Chemical Potential                  WORK done
ENERGY                            by Car
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
If energy is not created or destroyed (only transformed), then
where does it go when…

1. A car with KE stops?

2. A person eats food, climbs a mountain, and stops?

3. A light bulb transforms electrical energy to light/heat
then...?
How much PE?

How much KE?...
In what direction?
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”
Place cup at known distance from
ramp (you choose)… using what you
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.

```
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