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ENERGY
What is Energy?
Energy is the
capacity to do
work or to
produce heat
3 Main Forms of Energy
1.Kinetic Energy – The
energy of motion
Ex: Pushing a desk,
riding a bike,
lifting your hand
Sub categories of Kinetic Energy
Mechanical Energy – Energy from
objects moving
– Examples: engine running, watch hands
turning, man running
Thermal Energy – Energy caused by
the motion of particles
– Examples: wood burning, paper
burning, engine cooling, pan hot from
stove.
2.Potential Energy –
the energy of
position
Ex: holding an object
up that is going to
fall, food, battery
Sub categories of Potential Energy
Gravitational potential energy – The
energy an object has because it is off
of the earth’s surface (you in your
seat)
Chemical Energy – Energy stored in
elements/compounds that will be
released during a chemical reaction
(batteries, food)
Electromagnetic Energy - Energy in
the form of wavelengths, usually
light.
Electrical Energy – energy that exists
when objects with different electrical
charges are separated
– Batteries, appliances, lightning
3.Radiant Energy –
the energy of the
sun
Not important for
this class just
know it as a type
of energy
How to Measure Energy
The most common unit for
energy is the calorie
(cal).
1 calorie = the amount of
heat needed to raise the
temperature of 1 gram of
o
water by 1 C
The SI Unit for energy is
the Joule (J)
1 cal = 4.184 J
Pronounced like “jewel”

Law of Conservation of Energy
In any process,
energy is neither
created or destroyed
(just transferred)
For example…..
When a match is lit, it
first possesses potential
energy and as it burns it
has the energy of heat
(thermal kinetic)
Bell work: Identify the Type of Energy
Dimensional Analysis
UGK!!
Dimensional Analysis
UGK!!