Transcript Energy - School helper

Energy
S8P2: Students will be familiar with the forms
and transformation of energy.
Questions to think about!
1.
What’s the difference between a
moving marble and one at rest?
2. How can a marble acquire energy- the
ability to cause change?
What is energy?
• This is the ability to cause change.
• Types of energy: kinetic, potential,
thermal, chemical, radiant, electrical, and
nuclear.
• Everything has energy, but you do not
notice it until a change has occurred.
What is kinetic energy?
• This is the energy an object has due to its
motion.
• If an object is not moving, it does not have
kinetic energy.
• A soccer ball has kinetic energy when it
rolls on the ground.
How is kinetic energy applied to
speed?
• If we kick the soccer ball harder it speeds
up.
• When the fast soccer ball hits the net the
net moves faster.
How is kinetic energy applied to
mass?
• Lets say we roll a volley ball down the
road to hit some bowling pins.
• At the same time we roll a bowling ball at
the same speed, which one will knock
down more pins?
• If you said the bowling ball you are correct.
• This is because the volley ball has less
mass.
What is potential energy?
• This is the energy stored in an object
because of its position.
• A cup sitting on a counter has potential
energy.
• If the cup is pushed over it changes from
potential to kinetic.
• The more mass the more potential energy.
What is thermal energy?
• This is energy that increases when the
temperature increases.
• Lets say we are inside a house, during
the summer, that is very cool, then we
walk outside. What happens?
• As the temperature increases outside
our thermal energy increases.
What is chemical energy?
• This is the energy stored in chemical
bonds.
• Flames of a candle is the result of
chemical energy stored in the wax.
• When the wax burns it is changed from
chemical energy to thermal energy.
What is radiant energy?
• This is the energy carried by light.
• The coils on a stove burner produces
radiant energy when heated.
• To heat the metal coils another type of
energy is used, electrical energy.
What is electrical energy?
• This is the energy that is carried by an
electric current.
• A cell phone uses electrical energy.
• Basically anything that has to do with
electricity uses electrical energy.
What is nuclear energy?
• This is energy contained in atomic nuclei.
• To release nuclear energy, is a difficult
process.
• One of the first major usage of the nuclear
energy is the atomic bomb.
The Atomic Bomb
The atomic bomb was created by Albert
Einstein and many others. At the
beginning of WWII Einstein sent a letter to
President Roosevelt, which begin the
making of nuclear bombs in the United
States. These bombs use a major amount
of nuclear energy.
What is The Law of Conservation of
Energy?
• States that energy is never created or
destroyed, just like the Law of
Conservation of Matter (matter is never
created or destroyed, just changes form.)
• The only change is the form in which the
energy appears.
Example
When a biker goes up a tall hill, energy
changes. When he gets to the summit, all of
his original energy is still around. Some of the
energy is in the form of potential energy,
which he will use as he coasts down the hill.
Some of the energy has changed to thermal
energy by the friction of the bike. The
chemical energy in the biker has changed to
thermal energy, this is when he is hot. No
energy is missing from the biker.
“No matter what you are doing you have
energy. It can be potential, kinetic,
thermal, chemical, and radiant.”
John Dalton
Credits
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CRCT Coach Book
8th grade Science book
Google pages
http://electron9.phys.utk.edu/phys136d/modules/
m8/images/gen.gif
• http://www.astrosciences.info/Ergodynamics_file
s/image001.gif
• http://www.mhhe.com/physsci/chemistry/chang7/
esp/folder_structure/en/m1/s1/assets/images/en
m1s1_1_1.jpg
• http://www.mathtrain.com/mathtrain/file.ph
p/1/iconsfrontpage/basketball.gif
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