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Energy
Dayna Martínez
Javier Fuentes
STARS
University of South Florida
Maniscalco Elementary
What is energy?
Energy is
defined as
the ability to
do work.
What is work?
Work = Force x Distance
Potential and Kinetic Energy
Potential Energy
Stored energy and energy of position
Kinetic Energy
Energy of motion
Law of Conservation of Energy
• Energy can never be made or destroyed
but it can change forms
Example:
A car transforms the gas stored into movement.
This is an example of energy transformation.
Can you think of
another example?
Energy Transfer
• Movement of energy from one place or
object to another.
Forms of Energy
Solar energy
Energy that comes from the sun
Light
Radiatio
n that
we can
see
Heat
Radiatio
n that
we can
feel
Forms of Energy
Chemical energy
Energy that can be released by a chemical
reaction
Forms of Energy
Mechanical energy
The combination of all the kinetic and
potential energy that something has
Forms of Energy
Electrical energy
Energy that comes from an electric current
Electric current
Results from the movement
electrons
of
Forms of Energy
Sound Energy
Waves of energy created when an object vibrates.
Sound energy can travel through many objects.
Sound Waves
-Sound waves require some kind of material to travel through. They can’t
move through a vacuum.
-Sound waves move much slower than light waves.
-Sound waves are like heat conduction. No particles actually travel.
Sound waves are
traveling through the
air from the clock to
her ears.
But what is really
traveling is
ENERGY!!!
How does sound waves travel?
Particles get bumped, and they bump the ones next to them.
Sound should travels
faster in a solid or liquid,
where the particles are
closer together and can
bump each other quicker.
•
Sound waves travel down
the ear canal and hit the
eardrum which vibrates
•
The hammer, anvil and
stirrup transfers the
vibration and amplifies it
•
This amplified vibration is
passed into the inner ear
•
Inside the inner ear there
are nerve cells that
transmit electrical pulses
to the brain as they are
stimulated.
•
The brain can interpret
these pulses as 'sounds'.
And that's how we hear!
Lab Sound Travels
• Page 79