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ENERGY!
Energy!

Energy is the capacity to do work, and ability to
cause motion
 It
cannot be created or destroyed.
 It is only able to be transformed from one form to
another, but the net (or total) amount of energy does
not change.
Types of Energy!

Mechanical Energy – the
energy stored in an object
due to its motion or position.
Can be classified in 2 ways.
 Potential
– stored energy
due to objects relative
position
 Kinetic – energy of motion.
Amount of energy depends
on objects mass and velocity.
Types of Potential Energy

Remember energy stored due to position. It has the
ability or “potential” to move.
 Elastic
– energy stored by things that stretch. Example?
 Gravitational Potential Energy- energy stored by
objects that are lifted off the ground.
GPE

The amount of Gravitational Potential Energy (GPE)
is determined by an objects…
 Height
– more height, more GPE
 Acceleration due to gravity, More gravity, more GPE
 Mass – more mass, more GPE

GPE = mgh
Other Forms

Chemical Energy – any
energy associated with
atoms, ions and molecules.
Energy stored in the bonds
that hold them together.
 This
energy changes into
another form during chemical
reaction.
Other Forms



Electrical Energy – another
term for electricity. Energy
stored in electric charges.
Thermal Energy – type of
energy that comes from heat
and vibration of molecules.
Light/Radiant Energy –
energy associated with
electromagnetic spectrum and
light waves.
Other Forms Cont’d…


Sound Energy – Energy that
is associated with the
movement of sound waves.
Nuclear Energy – Energy
associated with the nucleus
Law of Conservation of Energy

Energy can never be created and never destroyed.
Energy can only change from one form to another.
 Net
Energy is the total amount of energy in a system.
 The total or net amount of energy must stay the same
when energy changes forms.

The Potential energy plus the Kinetic Energy must
equal 100%. Net energy must stay the same.
Energy Conversions
Explain what energy we are starting
with and what energy we are
ending with for the following
products:




A fan
A battery
A fire
A glowstick
Example:



As a swing moves back and forth, the energy is
converting from one form to another…..
Why will the swing eventually stop?
In what form will that energy be transferred into?