Transcript What Is Energy?

Energy Part I
Notes on the
different types of
energy
What Is Energy?
Energy is the ability to do work.
 Work
happens when force causes an object to
change or move.
NO WORK
WORK
Types of Energy
 KINETIC
energy is the energy of all
moving objects.
 POTENTIAL
energy is the stored
energy an object has because of its
position.
KINETIC ENERGY



KINETIC ENERGY (KE) depends on speed
and mass.
The more speed an object has, the more
kinetic energy is has.
The more mass an object has, the more
kinetic energy it has.
Which has more KE:
a car moving 50 km/hr
OR a car moving 90
km/hr?
90 km/hr—objects with
more speed
have more KE
Which has more KE: an
elephant running 3 m/sec OR
an ant running 3 m/sec?
Elephant—objects with more
mass have more KE
POTENTIAL ENERGY
 POTENTIAL
ENERGY (PE) depends on weight
and height.
 The more weight an object has, the more PE it
will have.
 The higher up an object is, the more PE it will
have.
Which object has more PE in the
following examples:
1. A rollercoaster at the top of a
hill OR at the bottom of a hill.
Top—higher objects
have more PE
2. A bowling ball dropped off the
top of a building OR a golf ball
dropped off the top of a building.
Bowling ball—objects with
more weight have more PE
REMINDER: Energy is the
ability to do WORK.
 There
are 7 Forms of Energy that can
cause things to MOVE, or do WORK.
 ATOMIC
(NUCLEAR)
 CHEMICAL
 HEAT (THERMAL)
 ELECTRICAL
 LIGHT (RADIANT)
 MECHANICAL
 SOUND
The 7 Forms of Energy can be
remembered using this
acronym:
AC HELMS
ACHELMS
ATOMIC ENERGY- the energy generated
when the NUCLEUS of ATOMS join
together or split apart.
EXAMPLES:
 Atomic Energy gives the Sun its energy.
 Atomic bombs.
ACHELMS
CHEMICAL ENERGY- the energy stored in
matter that is released during a chemical
change.
EXAMPLES
 Burning chemicals in fuel to make heat
 Using chemicals stored in batteries
 Digestion of food
ACHELMS
HEAT/THERMAL ENERGY- the energy that is
related to heat and the temperature of matter.
NOTE: The faster the particles move the more
heat/thermal energy is generated.
Examples:
 The sun making you warm
 Fire
 Radiator
ACHELMS
ELECTRICAL ENERGY the energy of
electrically charged matter.
EXAMPLES:
 Energy traveling through a wire
 Lightning
ACHELMS
LIGHT/RADIANT ENERGY the energy caused by
the vibration of electrically charged atoms.
EXAMPLES
 Visible light
 Sunlight
 Electrical lights
 X-rays
 Microwaves
 Ultraviolet light (UV rays)
ACHELMS
MECHANICAL ENERGY-the energy of matter
that has potential and kinetic energy.
EXAMPLES:
 Living Organisms
 KE
when move
 PE from food
 Cars
 KE
when moving
 PE from gasoline (also chemical)
ACHELMS
SOUND ENERGY -the energy from the
vibration of an object.
EXAMPLES:
 Guitar strings
 Vocal chords
ALL 7 Forms of Energy can be
either POTENTIAL AND/OR
KINETIC
EXAMPLE:
A guitar string being pulled
back is potential sound energy.
When the guitar string is
released, it is changed to kinetic
sound energy.
ENERGY CONVERSION- A
change in one type of energy to
another is called an energy
conversion
Conversion also means
transformation