Potential
and Kinetic
Energy
How is all energy divided?
All Energy
Potential
Energy
Gravitation
Potential
Energy
Elastic
Potential
Energy
Kinetic
Energy
Chemical
Potential
Energy
What is Potential Energy?
o Energy that is stored
and waiting to be
used later
What is Gravitational Potential
Energy?
o Potential energy
due to an object’s
position
Don’t look down,
Rover!
Good boy!
o P.E. = mass x
height x gravity
What is Elastic Potential Energy?
o Potential energy due compression or
expansion of an elastic object.
Notice the ball compressing
and expanding
What is Chemical Potential Energy?
o Potential energy
stored within the
chemical bonds of
an object
What is Kinetic Energy?
o Energy an object has due
to its motion
o K.E. = .5(mass x speed2)
TYPES OF
ENERGY
Mechanical,
Electromagnetic,
Electrical,
Chemical and Thermal
What is Mechanical Energy?
o Energy due to a
object’s motion (kinetic)
or position (potential).
The bowling ball has
mechanical energy.
When the ball strikes
the pins, mechanical
energy is transferred to
the pins!
Examples of Mechanical Energy
What is Electromagnetic
Energy?
o Light energy
o Includes energy from
gamma rays, xrays,
ultraviolet rays, visible
light, infrared rays,
microwave and radio
bands
What is Electrical Energy?
o Energy caused by
the movement of
electrons
o Easily transported
through power lines
and converted into
other forms of energy
What is Chemical Energy?
o Energy that is
available for release
from chemical
reactions.
The chemical bonds in
a matchstick store
energy that is
transformed into
thermal energy when
the match is struck.
Examples of Chemical Energy
What is Thermal Energy?
o Heat
energy
o The heat energy of an
object determines how
active its atoms are.
A hot object is one whose atoms
and molecules are excited and
show rapid movement.
A cooler object's molecules and
atoms will show less movement.
QUIZ TIME!
What type of energy
cooks food in a
microwave oven?
ELECTROMAGNETIC
ENERGY
What type of energy is
the spinning plate inside
of a microwave oven?
MECHANICAL ENERGY
QUIZ TIME!
Electrical energy is
transported to your house
through power lines.
When you plug an electric fan
to a power outlet, electrical
energy is transform into what
type of energy?
MECHANICAL ENERGY
QUIZ TIME!
What energy transformation
occurs when an electric lamp is
turned on?
ELECTRICAL ENERGY

ELECTROMAGNETIC ENERGY
What types of energy are shown below?
Mechanical and Thermal Energy
(Don’t forget friction)
What type of energy is shown below?
Chemical Energy
What types of energy are shown below?
Electrical, Mechanical and
Electromagnetic Energy
What type of energy is shown below?
Chemical Energy (yummy)
What type of energy is shown below?
Thermal Energy
Heat Transfer
Conduction, Convection and
Radiation
What is Conduction?
• Conduction – heat
transferred by
particles colliding
into one another,
such as in a metal.
• Transfer of energy
by touch
• Not an effective
transfer in a gas.
• Primarily solids
Conduction
What is Convection?
• Convection – heat transferred by the
circulation of a fluid (or gas), such as in a
heating system at home; important near
the surface of the Sun.
• Hot air rises cool
air falls
Convection
What is Radiation?
• Radiation – heat transferred by the flow of
electromagnetic radiation, like heat felt
from the campfire.
• Radiation is the only type of heat transfer
that can happen in a vacuum.
• Heat transfer
through waves
Radiation
Heat Transfer Sum It Up
• CONDUCTION: the transfer of energy through
matter by direct contact of particles.
This can happen in solids, liquids and gases.
• CONVECTION: the transfer of energy because of
the movement of bulk masses of particles.
This can happen only in liquids and gases not in solids.
• RADIATION: the transfer of energy by
electromagnetic waves.
Energy can move by radiation in air like the heat
from your electric stove top, or in the vacuum of
space the way the Sun heats the Earth. In
radiation, the energy does not have to transfer
through mass (particles).
Conduction, Convection, or Radiation?
Walking on Hot Coals