1. What is the KE at point A? Why?
2. What is the PE at point A?
3. What is the ME at point A?
4. What is the height at point B?
5. What is the height at point C?
1. What is heat?
2. How does thermal energy play
a role in the Law of
Conservation of Energy?
Bill Nye; Heat
BEFORE: List the forms of energy that you know
DURING: Write notes about
heat, conduction, convection, radiation
AFTER: Write a paragraph that describes thermal
energy, heat, and the processes of
conduction, convection, and radiation.
Roller Coaster Energy Problems
1. Find the PE at point A.
2. Find the KE at point A. Answer the
3. Find the ME at point A. problems on
4. Find the KE at point B. the left on your
sheet under the
5. What is the ME at point C? roller coaster
6. Find the PE at point C. picture.
7. Find the KE at point C.
1. Describe the energy transfers
that occur in a light bulb.
2. Describe the energy transfers
that occur when the body is
powered by food.
1. Describe the energy transfers
in a hairdryer.
2. What is the difference
between renewable and
Forms Explanation Example
Total energy of
motion and position
Total kinetic energy
Energy stored in
Energy of moving
Energy of vibrating
Vibrations of electrically
Energy in the nucleus of
1. Mechanical Energy
total energy of motion and position
ME=KE + PE
An object on the top of a hill has
high ____ energy and low ____
As the object rolls down, what
Why does there seem to be less
energy at the bottom of the hill
than at the top?
2. Electrical Energy
the energy of moving electrons
Like charges repel and
Opposite charges attract
Two Types of Electricity
The Power of Electricity
Can be turned into other kinds of energy
Can do work
Hairdryer converts electric to thermal
Alarm clock converts electric to sound and
3. Nuclear Energy
the energy of the nucleus of an atom
Pros and Cons of Nuclear Energy
+ make electrical + fuel is plentiful
energy + only small amounts
+ no carbon dioxide or of radioactive waste
other gases products
- limited fuel supply - not currently
- radioactive waste practical
products - large amount of
- possible release of energy needed to
radioactive material heat and contain the
Giant nuclear fusion
Ultimate source of
energy for our planet
4. Chemical Energy
the energy of rearranging atoms
Is photosynthesis endothermic or
Is respiration endothermic or
5. Sound Energy
the energy of vibrating particles
Making Sound vs. Hearing Sound
Have you heard this riddle?
If a tree falls in the forest and no one is around to
hear it, does the tree make a sound?
What do you think?
When a tree falls and hits the ground, the tree and
the ground vibrate. These vibrations are
transferred to the surrounding air.
So there would be a sound!!!
Change Frequency = Change Pitch
TRY IT! – Vocal cords
WATCH IT! – Jars vs. Bottles
Hold the cut rubber band stretched tight.
Have a partner pluck the rubber band with
Notice the pitch.
Shorten the length of rubber band by
holding it in the middle.
What was different??
6. Light Energy
the vibrations of electrically charged particles
The EM Spectrum
Visible light is one portion of
the Electromagnetic Spectrum.
All of these waves are energy-
Insects, like bees, see shorter
wavelengths than humans.
What type of EM waves do
WATCH IT! - prism
Possibilities of Light
Light rays move away from their source in straight lines.
When they hit something, they are either
Absorbed Reflected Refracted
(stopped) (bounced off) (bent)
WATCH IT! - Mirror
Fill beaker half full of water.
Put a pencil in the glass.
Look at the pencil through the side of the
How does the pencil look different than it did
before you put it in the water?
This is an example of ______________.
Prop up the card with the arrow on it.
Place a glass of water a little to one side of the
card and a few inches in front of it.
Now stoop down until your eyes are level with
Slide the glass between the card and your
eyes. Try sliding it back and forth a few times.
What happened? What causes this?
Light Source or Not?
You can see a light source even in the dark
because its light passes directly into your
eyes. Most things around you are not light
sources. Why can you still see them?
You can still see them because light from
light sources reflects off the objects and
then travels to your eyes.
The Speed of Light
Watch this clip to learn more about the speed of
Check your Light Understanding
What is a photon?
On the EM spectrum, what type of EM radiation
has the highest energy – radio waves, gamma
rays, or x-rays?
What are 3 possible things that can happen to
light rays after they leave the source?
Sound & Light: Alike, but Different
*vibration *does NOT
*needs a medium need a medium
7. Thermal Energy
the total kinetic energy of the particles
more thermal energy
= faster moving
less thermal energy
= slower moving
Thermal Energy vs. Heat
Heat is the transfer of energy between
objects that are at different
Three Kinds of Heat
Conduction Convection Radiation
(touch) (current) (rays)
Check your Thermal Understanding
Is thermal energy kinetic or potential?
If you touch something in which the particles are
moving faster than the particles in your skin, how
would it feel?
When objects have more thermal energy than their
surroundings, what do you predict will happen in
terms of heat?