Download Kinetic vs. Potential Energy

What is Energy?
p. 43 in ISN
What is Energy?
The ability to do work or cause
change.
Different forms of
Energy
•
•
•
•
•
•
Potential
Kinetic
Thermal, or heat
Chemical
Light
Sound
Potential Energy
• Stored energy
• Can be stored chemically as fuel,
in the nucleus of an atom, and in
foods.
• Can also be stored because of the
work done on it…
For Example…
Stretching a rubber
band
Winding a watch
Lifting a brick high in
the air
Gravitational Potential
Energy (GPE)
• Potential energy that is
dependent on height
Gravitational Potential Energy
• A waterfall, a suspension bridge, and a falling
snowflake all have gravitational potential energy.
Kinetic Energy
• Energy of motion
• The faster an object moves, the
more kinetic energy it has.
Examples
 A basketball player has kinetic energy.
The movements that she does show the
energy that is being displayed while she is
moving.
 When you are running, walking, or
jumping, your body is exhibiting kinetic
energy.
Can you think of an
example of something
that has both potential
and kinetic energy?
 A waterfall has both kinetic and potential
energy.
 The water at the top of the waterfall has
stored potential energy.
 Once the water leaves the top of the
waterfall, the potential energy is changed
into kinetic energy.
In Your Notebook….p.42
• Draw pictures of potential and
kinetic energy
• Write a summary underneath each
picture describing what each type of
energy is and how your pictures
shows it.
The Law of
Conservation of Energy
p. 45 in ISN
Energy can be neither created nor
destroyed by ordinary means.
– It can only be converted from one form to
another.
Kinetic-Potential Energy
Conversion
Roller coasters work because of the energy that is
built into the system.
Initially, the cars are pulled mechanically up the
tallest hill, giving them a lot of potential energy.
From that point, the conversion between potential
and kinetic energy powers the cars throughout the
entire ride.
Kinetic vs. Potential Energy
At the point of maximum potential energy,
the car has minimum kinetic energy.
Kinetic-Potential Energy
Conversions
• As a basketball
player throws
the ball into the
air, various
energy
conversions
take place.
Ball slows down
Ball speeds up
Energy Tree Diagrams
• Energy Tree Diagrams show the
types of energy involved in an
interaction.
• They show energy transfers that
occur.
Energy Tree Diagrams
– Ovals – indicate the types of energy
(kinestic, heat, GPE)
– Arrows – indicate the energy
transfers, either from type to type or
from one interaction to another
– Descriptions – explain the event
linked to the energy transfer.
Example
Chemical
Potential
Energy
Burning Log:
Fire
Crackles
Log Burns
Sound
Energy
Flame
Glows
Light is
absorbed
Light
Energy
Heat
Energy
Heat
Energy
Warms
air
Think of your wind-up toy…
• On p. 44 in your ISN, draw a picture
showing your wind-up toy’s adventure
and label the types of energy you identify.
• Use “Handout A: Types of Energy” to
create an energy tree diagram with your
group, tracking the energy in your toy’s
adventure.
• Write a 5 sentence summary about the
notes from today.