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Transcript
```The Nature of Energy
Section 4.1
Energy



Every change that occurs involves
Moving objects have energy
You can tell an object has energy when it:
Changes its environment
 Changes itself
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
Energy
Electrical – moving electrons
 Chemical – from bonds
 Thermal- heat

.
Energy

Energy exists in many different forms

It may look different, but it’s still energy.
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Examples: fire, movement, gasoline in a bucket
Kinetic energy- energy in the form of motion
Depends on mass and velocity of an object
 Increase in either mass or velocity = increase in
energy
 KE =1/2 mv2
 Units = kg*m/s

Types of Energy


KE = ½ mv2 Velocity changes will impact KE
more because velocity is squared.
Potential Energy – energy of position


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Energy in stationary objects and bonds
Elastic Potential Energy – Energy of
compression or stretching
Chemical Potential Energy – Energy stored in
bonds

Gasoline, food, hand warmers
Types of Energy

Gravitational Potential Energy- Energy stored
due to position above the surface of Earth
Depends on mass of object, height of object above
ground, and acceleration due to gravity
 GPE = m x h x g
g = acceleration due to gravity


All energy – measured in units of Joules


1 J = 1 kgm2/ s2
Energy can be converted:

As an object falls, GPE decreases and KE increases
```
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