Download Kinetic Energy

Add to the science definition
of ENERGY in your journal

Energy is an abstract concept
like love or freedom and is
difficult to define…
 Energy:
Scientists define
energy as the
ability to do work
or cause change.
LAW of CONSERVATION OF
ENERGY
 Energy
cannot be created or destroyed,
it only changes form.
Sources and Forms of Energy
Kinetic and
Potential
Energy
 The
two main categories of energy are
kinetic and potential energy
 Kinetic Energy: energy of motion
 Potential Energy: stored energy

http://www.youtube.com/watch?v=7K4V0NvUxRg&feature=related Eureka

http://www.youtube.com/watch?v=mhIOylZMg6Q
MIT
Potential Energy


This is stored energy
that is capable of
producing motion.
Examples:
1. Ruler + ball
2. Newton’s Cradle
Example 3
 Boulder
on hill
Has gravitational
potential energy
because of its
position above
the flat area
below
 Example
 Ball
in air
Has gravitational
potential energy at
top of path because
of its position
4
 Example
5:
 Bent bow
 (ready to
 fire)
Has stored
mechanical
potential energy
because of the
changed shape
of the bow


The second main category of types
of energy: Kinetic Energy
This is energy of motion.
Kinetic energy is the
motion of :





Waves
Electrons ( negatively
charged particles in atoms)
Atoms (the smallest
component of an element
having the chemical
properties of the element )
Molecules (The smallest
unit of a substance that has
all of the physical and
chemical properties of the
substance )
Teaching with style and the
Law of Conservation of
Energy
Notes on types of Potential
Energy

Energy stored in the Chemical
BONDS of atoms and
molecules.
 ONLY ELECTRONS are
involved in chemical
bonds (NOT NUCLEUS)

Energy
Examples• sugar
• petroleum (crude oil used to
make gasoline)
• natural gas, which is a
mixture natural gasses
found in the earth (methane,
propane, butane)
• fireworks
• Alka-rocket lab TWIG
http://www.youtube.com
/watch?v=G20iSK_Jm8
Why are the following examples
Chemical Energy?
 Alka
Seltzer and water
 Burning a match
 A battery
 Burning gasoline to move your car
Nuclear Energy

Energy that is stored
in the nucleus of an
atom
 Bonds that hold the
nucleus together can
release enormous
amounts of energy.

http://www.youtube.com/watch
?v=aldkHWESzw&feature=related
2 Types of Nuclear Reactions
 FUSION
- a nuclear
reaction in which
nuclei combine to
form more massive
nuclei
 Examples:


Sun
Hydrogen Bomb
 FISSION
- nucleus
of an atom splits into
two or more smaller
nuclei
 Examples:


Nuclear Power
Plant
Atom Bomb
How does Nuclear Power Work?
Fission and Fusion-high (8.5 min)
Arial view of exploding atomic bomb
Fukashima Plant
http://www.youtube.com/watch?v=kjx
-JlwYtyE

Diagram of an Atom:
Stored Mechanical Energy

Energy that is stored
in objects by
application of a force.
 Example


Compressed springs
Stretched rubber
bands
mousetrap
Video 1: 1 minutes
Gravitational Potential Energy

Energy of place or
position.
 Requires gravitational
force
 GPE = mgh
TWIG


When I hold a ball in
the air-if I let it drop
gravity will act on it
When the ball is let go
it becomes an
example of motion
 eg. Marble maze
energy
 Newton’s cradle
Potential
• Gravitational
• Chemical
• Nuclear
• Stored Mechanical
“Good Canoes Never Sink”
Assignment
 Open
your notebook
 Without looking back through your notes:

List the four types of potential energy
and give an example for each
The second main category of types
of energy: Kinetic Energy


This is energy in motion.
Kinetic energy is the
motion of :





ANY OBJECT (visible or
not)
Waves
Electrons ( negatively
charged particles in atoms)
Atoms (the smallest
component of an element
having the chemical
properties of the element )
Molecules (The smallest
unit of a substance that has
all of the physical and
chemical properties of the
substance )
TWIG
Motion

Movement of objects
or substances from
one place to another.



Wind
Ball dropping
Any moving object
Thermal Energy
What is temperature?
Thermal Energy

Temperature

A measure of the speed
of atoms and molecules
Eureka
Thermometer
FOSS
What is heat?

HEAT

Thermal Energy
Transfer of energy
between objects at
different temperatures
• Eureka temp vs heat
• Eureka Heat as
Energy
Conduction
Foss

Electrical Energy
Is the movement of
electrons.


Lightning
Electricity
(Youtube)
How magnetic field is
produced
How do generators and
motors work?
How is electricity made?
How do you build a
battery?
Some forms of kinetic energy
travel in waves
 Ocean
waves
 Seismic Waves
 Light
 Sound
 There
are 2 kinds of
waves:
 transverse (up and down)
 longitudinal (compression)

Clip showing wave motion
 http://www.acs.psu.edu/drussell/de
mos/waves/wavemotion.html
Radiant Energy

Electromagnetic
energy that travels in
transverse waves.
 This energy includes:




X-rays
Gamma rays
Radio waves
SOLAR ENERGY
Eureka Radiation Waves
Khan
The Electromagnetic Spectrum
& transverse waves
Can you Hear Sound on the
Moon?

Movement of energy
through objects in
longitudinal
(compression) waves.
 Eg:
 Slinky and compression
waves

The human ear

Tuning fork

Play 3-4 minutes
Sound
The eardrum moves as a result of compression
waves sent through the air to the ear and it
transfers the sound to the inner ear and
eventually to the auditory nerve
Assignment
 Follow
instructions on the board. Then
 Open your notebook
 Without looking back through your notes:


List the five types of kinetic energy and
give an example for each energy type
Can you come up with a term or phrase
to help you remember them?
Kinetic
•
•
•
•
•
Radiant
Electrical
Thermal
Sound
Motion
“TERMS”
Kinetic & Potential Energy
Eureka Potential
Video Notes handout
1-Nasa 4
2-Cons energy
5 min
3-Disney 24
4-nyenergy
21 min
Energy Graphic Organizer
1.5 cm
Measure and
Cut and/or
Draw Lines
4 cm
4 cm
Draw same
lines inside
4 cm
4 cm
4 cm
Label Your Rectangles
Picture
Kinetic
Potential
Radiant
Chemical
Thermal
Nuclear
Motion
Gravitational Potential
Sound
Stored Mechanical
Electrical
<Your Name>
Type of
energy
Label the inside of your foldable
Energy
Conversion
Definition Definition
Energy
Conversion
1. (One from Labs)
Thermal<definition>
1.
Chemical<definition>
2.(One you develop)
2.
1. Radiant –>
Electrical
Solar panel
converted light into
electricity
2.
Radiant Energy Electromagnetic
energy that travels
in transverse
waves.
1.
1.
2.
Motion -<definition> Gravitational
Potential<definition>
1.
Sound -<definition>
1.
Nuclear-<definition>
1.
2.
Stored Mechanical-
2.