Transcript Energy Notes

Energy
What is energy?
“The ability to do work”
What is work?
F x d = Work
Force
Distance
Energy
Work has been done on the box.
Force
Distance
Energy
As long as you apply a force as
an object travels a distance,
you’re working!
d
You must have both
force and distance.
d
Energy
What is the unit for work and energy?
F x d = Work
Newton x meter = N • m
N • m = Joule (J)
Energy
What is the unit for work and energy?
1 Joule (J)
Named after. . .
James Prescott Joule
Energy
Energy is like wealth.
Both can exist in a variety of forms.
Wealth
- money
- real estate
- jewelry
- cars
- stocks
Energy
- electrical
- heat
- nuclear
- chemical
- elastic
Energy
With both, you can convert one
form into another.
Wealth
- money
- real estate
- jewelry
- cars
- stocks
Energy
- electrical
- heat
- nuclear
- chemical
- elastic
Energy
With both, you can convert one
form into another.
Wealth
money
- real estate
- jewelry
- cars
- stocks
Energy
- electrical
- heat
- nuclear
- chemical
- elastic
Energy
With both, you can convert one
form into another.
Wealth
- money
- real estate
- jewelry
- cars
- stocks
Energy
- electrical
- heat
- nuclear
- chemical
- elastic
Energy
With both, you can convert one
form into another.
Wealth
- money
Energy
- electrical
- real estate
- jewelry
- cars
- stocks
- nuclear
- chemical
- elastic
heat
Energy
With both, you can convert one
form into another.
Wealth
- money
Energy
- real estate
- jewelry
- cars
- stocks
- heat
- nuclear
- chemical
- elastic
- electrical
Energy
There are two major types of energy.
1. Kinetic Energy (Ek)
- energy that all moving objects have
the amount of Ek is determined the object’s velocity
Energy
Kinetic Energy (Ek)
Greater Ek
high velocity (v)
Less Ek
low velocity (v)
Energy
There are two major types of energy.
1. Kinetic Energy
2. Potential Energy
Energy
Potential Energy (Ep)
- energy that is stored
- gravitational (Eg)
h
- chemical (Ec)
- elastic (Ee)
Energy
We can use bar graphs to show energy transfers.
Ek
Eg
Ee
before
Edis
Ek
Eg
Ee
after
Edis
Energy
Dissipated Energy (Ediss)
- energy that leaves the system
- leaves as heat, sound, light, etc.
- it is never lost
Energy
We can use pie graphs to also show energy transfers.
Ek
Ek
Edis
E
E
g
g
Ek
Edis