Transcript Energy - SCIENCEHOMEPAGE

Chemistry
Biology
Study of chemical
reactions.
Study of living things.
Science
Earth
science
Study of the earth.
Physics
How things work
Energy
Energy comes in many forms:
1.
Thermal
Steam, Sun, Geothermal
Ex.___________________________
2.
Chemical
Gas, Food, Batteries
Ex.___________________________
3.
Electrical
Lights, Stoves, Stereo, Television
Ex.___________________________
Energy comes in many forms:
4.
Sound
Speakers, Animals (Bats, Whales, Our Voices)
Ex.___________________________
5.
Light
Light bulb, Sun, Fire
Ex.___________________________
6.
N uclear
Power Plant, Sun is a nuclear furnace!
Ex.___________________________
Energy in Motion
Kinetic energy (KE)
is…
Energy that appears in
motion.
Examples of Kinetic Energy (KE):
Anything that moves!! 
Energy in Motion
(not in notes, but very important!!)
Every object has some
kinetic energy!!
Even objects that are
Except at ______
not moving.
______
(-273)
WHY???
All substances have moving or vibrating
atoms and molecules!!
The Temperature of an object is that objects
Average Kinetic Energy.
Energy in Motion
Kinetic energy (KE) depends on a moving
mass and ______.
velocity
objects _____
Which has more K.E., a train moving at 60mph or a car moving 60mph?HINT?
The Train
Which has more K.E., a car traveling at 30mph or the same car moving at 60mph?
The car moving 60mph
Joule (J), is its symbol, and it’s
The unit of energy is called the _____
James Prescott Joule an English Scientist.
named after __________________
James Prescott Joule
British physicist James Joule
is best known for his work in
electricity and
thermodynamics (the study of
heat). Joule discovered the
relationship between
electrical current, electrical
resistance
Potential Energy (PE)
Potential energy is…Energy that is stored in
an object. Based upon
position.
Examples of Potential Energy:
1. Bow and arrow
2. Rock at the top of a hill
3. Sledding or skiing at the top of the hill
4. A car full of gas.
Potential Energy (PE)
Who has the
most potential
energy,
Mr. Joule 1 or
Mr. Joule 2?
Potential Energy (PE)
Who has the
most potential
energy,
Mr. Joule 1 or
Mr. Joule 2?
Potential Energy (PE)
Potential energy is…Energy that is stored in
an object. Based upon
position.
PE= mass x height
Cantaloupe
20ft. Above the street
2 pounds
Watermelon
10ft. Above the street
4 pounds
Cantaloupe
20ft. X 2 pounds= 4 0PE
Watermelon
10ft. X 4 pounds= 4 0PE
 The potential energy is the same!! 
Potential Energy (PE)
B. Billy Bob decided to break the rules and “fling” a
rubber band across the room at his sweetheart Sally
potential energy was
Sue. When he did this ________
kinetic energy.
transferred to _______
C. Mechanical energy is…
Potential and Kinetic energy together
D. Give 3 examples of chemical potential energy.
1) Food
2) Fuel
3) Batteries
Mechanical Energy
= Potential + Kinetic
Efficiency- Is the difference between total potential
energy and total kinetic energy of the system. The
energy difference is lost as heat.
All three dishwashers accomplish the same task
equally, they clean a load of dishes. Which one is
more efficient?
Dishwasher 1
120 Units of electricity
Dishwasher 2
160 Units of electricity
Dishwasher 3
100 Units of electricity
Law of Conservation of Energy
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The total amount of energy remains constant.
Energy can not be destroyed nor created.
Energy can be converted into different forms.
Where is my kinetic and potential energy? What 2 forces cause Mr. Joule
to come to a stop at the top of
the hill?
KE Increasing
PE Decreasing
Friction &
Air resistance
KE low
PE high
KE Decreasing
PE Increasing
KE high
PE low
What is happening to the kinetic and potential energy?
.

KE
PE
KE
PE


KE
PE
KE
PE
KE
PE
Energy Lab
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Present 1 system with at least 6 forms of
energy conversions.
Slide #1: Present a diagram on a power point
with 6 forms of energy labelled. Site where
you found this diagram on the bottom of the
slide.
Slide #2: Write a paragraph for each system
explaining how energy is converted from one
form to another.
Complete the 25 multiple choice lab questions
Energy Project Rubric
25pts. Clear, colorful, and labeled
diagram on power point slide
 25pts. Written paragraph explaining
your system.
 25pts Multiple choice Lab Questions
 25 pts. Presentation with eye contact

Energy Project Diagram Example:
Sound energy
from speakers
Electrical energy
to charge battery
from cord.
Light energy
from screen.
Heat energy
given off
from fan
Chemical energy
from battery.
Electromagnetic Spectrum
Frequency in Hertz (Hz)
Only a small part
can be seen by
our eyes!
Wavelength in meters (m)
If you have electromagnetic radiation with a wave length of 1 meter, what is its frequency?
I have an electromagnetic wave with a frequency of 1019 hertz, what type of electromagnetic
radiation is this?
At what frequency does the radiation that causes skin cancer fall at?
If you have electromagnetic radiation with frequency of 1022 hertz, what is the wavelength?
What type of radiation has a wavelength of 102 meters?
End of Kinetic and
Potential Energy!
Heat Transfer Next!