Transcript ENERGY

ENERGY
CH. 15
ENERGY & ITS FORMS
15.1
►Energy
is the ability to do WORK
►Work is a transfer of Energy!
The energy of motion is called…
►Kinetic
energy!
2
►Ke = 1/2mv
►Kinetic energy depends
on an object’s mass &
speed!
Gravitational Potential Energy
► Gravitational
potential
energy depends on an
objects mass, height
above ground AND the
acceleration due to
gravity :-0
► PE = mgh
Another energy…Elastic potential
energy
► Bread
doesn’t bounce.
► It’s not “elastic”
► http://www.activitytv.com/958-bouncingbread-roll
FORMS of Energy
► Energy
is either KE or PE
► Then it is divided up into these groups:
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

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Mechanical
Thermal
Chemical
Electrical
Electromagnetic
Nuclear
15.2 ENERGY CONVERSION &
CONSERVATON
► Energy
can be converted from one form to
another.
► What energy conversions occur when you
light a match?
The Law of conservation of energy
states….
►You
go to jail
and pay heavy
fines if you
waste energy.
Actually…..
► It
states that energy cannot be created or
destroyed.
► Energy is CONVERTED from one form to
another.
► We often say, energy is lost due to “heat”.
What really happens is heat is given off and
radiates into the surroundings…it is
transferred.
When objects fall…
► PE
is converted into KE
Pendulums
►Pendulums,
eventually slow down
due to friction.
Mechanical Energy
►Conservation
of
Mechanical
energy
►(KE + PE)beginning
= (KE + PE)end
Einstein’s equation…E =
2
mc
► He
believed energy and mass can be
converted into each other.
► This
means a tiny amount of matter can
make a lot of energy!
► Think about how much energy one drop of
gasoline produces.
15.3 ENERGY RESOURCES
► Renewable
► Non-renewable
► Be
► fin
able to ID these on the OGT!