Transcript Energy - TeacherWeb

Warm-up
Look around you…
Lights
• ________________
• Identify at least 5
things in this room
that are using
energy right now.
• Are they all using
the same form of
energy?
Computers
• ________________
You
• ________________
Calculator
• ________________
Clock
• ________________
Various Forms of
Energy
Ch. 3.1
Energy is all around you…
• Where do the lights and appliances in your
Electricity
home get energy from? _____________
• Where do plants get their energy from to
make sugar? _____________
Sun
• Where do you get energy to carry out all
Food
your daily activities? _____________
Energy
forms of energy
• There are many different ________________
effects
and they cause many different ___________.
• One thing that all forms of energy have in
common is that they _________________
all cause changes to occur.
_________________________________.
ability to cause change
• Energy is the ________________________.
Forms of Energy
• Sound Energy
• Electrical Energy
• Electromagnetic • Heat Energy
.
Energy
• Nuclear Energy • Chemical Energy
• Solar Energy
• Mechanical Energy
Mechanical Energy
• Energy
_________________
that is
associated
_________________
with motion.
Ex: You opening a book.
Ex: Wind making a flag move.
Ex: A domino knocking over
another domino.
Ex: The hand of a clock
moving.
Forms of Energy
• Sound Energy
• Electrical Energy
• Electromagnetic
Energy
• Heat Energy
.
• Nuclear Energy
• Chemical Energy
• Solar Energy
• Mechanical Energy
Sound Energy
• ____________________
Sound results from the
____________________
vibration of particles in a
____________________
solid, liquid, or gas.
• Ex: When you hear a car
driving by, the structures
in your ear are detecting
the vibrations in the air
produced by sound energy.
• If you and a friend were in
space and he/she clapped,
would you hear it? ______
NO
Forms of Energy
• Sound Energy
• Electrical Energy
• Electromagnetic
Energy
• Heat Energy
.
• Nuclear Energy
• Chemical Energy
• Solar Energy
• Mechanical Energy
Chemical Energy
Energy that is stored in
• _____________________
the chemical make-up of
_____________________
matter.
__________________
• Ex: Chemical properties and
chemical changes (when
chemical bonds are ______
___________________).
formed or broken
Ex: When wood or gasoline
________,
chemical energy
burns
produces _____
heat and _____.
light
• Ex: The food you eat is
broken down and turned into
chemical energy used by
your cells.
Forms of Energy
• Sound Energy
• Electrical Energy
• Electromagnetic
Energy
• Heat Energy
.
• Nuclear Energy
• Chemical Energy
• Solar Energy
• Mechanical Energy
Electromagnetic Energy
• ____________________
Energy that is
____________________
transmitted through
____________________
space in the form of
____________________
“electromagnetic” waves.
visible light
• Ex: __________________
X-rays ultra violet
• Ex: ________,
radiation, gamma rays
• Ex: radio waves
• Ex: ______________
that
microwaves
cook food and transmit
cellular phone calls
Forms of Energy
• Sound Energy
• Electrical Energy
• Electromagnetic
Energy
• Heat Energy
.
• Nuclear Energy
• Chemical Energy
• Solar Energy
• Mechanical Energy
Heat Energy
• Heat
____________________
is a flow of energy
from
____________________
a higher temperature
to
____________________
a lower temperature.
• Ex: you can feel heat
fire
energy from _______,
the
______,
____________,
Sun
engines
friction
_____________,
and
machinery when in use
Forms of Energy
• Sound Energy
• Electrical Energy
• Electromagnetic
Energy
• Heat Energy
.
• Nuclear Energy
• Chemical Energy
• Solar Energy
• Mechanical Energy
Nuclear Energy
• _________________________
Energy created when an atom’s
_________________________
nucleus breaks apart (fission) or
_________________________
joins together with another one
_________________
(fusion).
Sun and stars continue
• Ex: the _____
to burn because of constant
nuclear reactions
• Ex: nuclear reactors inside
nuclear power plants
smoke detectors
• Ex: inside ______________
• Ex: _____________
P.E.T. scans at hospitals
help detect infection/disease
more accurately
http://www.world-nuclear.org/how/nonpower_uses_of_nuclear_energy.html
Forms of Energy
• Sound Energy
• Electrical Energy
• Electromagnetic
Energy
• Heat Energy
.
• Nuclear Energy
• Chemical Energy
• Solar Energy
• Mechanical Energy
Solar Energy
• _____________________
Light that is directly
_____________________
converted into electrical
_____________________
energyWill
by solar
yourcells.
solar-powered radio
or house continue to work if
• Ex: solar-powered
there is no light?
radio NO,
house
_________,
__________,
in order to make electrical
street
and _________________.
energylight
there NEEDS to be light!...
the light is converted!
• The solar panel of a
_________________
calculator
collects light and turns it
electrical
into ___________
energy
for it to work.
Forms of Energy
• Sound Energy
• Electrical Energy
• Electromagnetic
Energy
• Heat Energy
.
• Nuclear Energy
• Chemical Energy
• Solar Energy
• Mechanical Energy
Electrical Energy (Electricity)
of electric charge
• The flow
_______________
through a conductor.
__________________.
• When using electrical
energy in appliances and
electronics, the charges
follow a conductive wire.
• Electrical energy is a
secondary source of
energy (its generated by
other sources).
• Ex: static electricity,
lightning, electronics
2 General Types of Energy
• Kinetic energy – the
energy of motion
• Depends on mass and
speed of object
• Examples:
– Bouncing ball
– Skiing downhill
– Flying kite
• Potential energy –
stored energy
• Depends on position or
chemical composition
(make-up).
• Examples:
– Ball held in hand
– Skier atop of mountain
– Kite laying on ground
Kinetic Energy
• The kinetic energy
increases as mass
increases.
• If a bowling ball
and soccer ball
were rolling at the
same speed, which
would have more
K.E. and why?
Bowling ball because it has
more mass.
• The kinetic energy
increases as speed
increases.
• If 2 identical
bowling balls were
rolling at different
speeds, which
would have more
K.E. and why?
The faster one because it
has a greater speed.
At which time does this skater
have more K.E. and why?
10 mph
35 mph
He is traveling at a higher speed!
Potential Energy
• Depends on the position…
• The higher an object is above ground and the
more mass it has, the more P.E. it will have
Gravitational P.E.
due to gravity.
• The more a rubber band or string to a bow
and arrow is stretched, the more P.E. it will
have due to the tension. Elastic P.E.
• The more you push a spring down like in a
jack-in-the-box, the more P.E. it will have
Elastic P.E.
due to the pressure.
• Once the P.E. is released, it turns into K.E.!
Potential Energy
• Depends on the chemical composition
(make-up) of a piece of matter…
• Chemical energy in food is a form of P.E.,
but when the chemical bonds are broken
apart (through cooking or digesting) energy
is released as K.E.!
Chemical P.E.
• Chemical energy in fuel is a form of P.E.,
but once the fuel is ignited the chemical
bonds break down and change releasing K.E.!
Which has more potential
It’s being
energy and why?
stretched.
It’s at a higher
elevation.
Which has more potential
energy and why?
The closed Jack-inthe-box because its
under pressure.
They are both going 5 mph, but
which has more kinetic energy?
Why?
The big truck because it has
more mass.
Name all the types of energy
you know of in this picture.
Heat
Energy
from
the
engine
and
friction.
Electrical Energy from electricity
produced by the car battery.
Chemical Energy
because of the fuel being
burned.
Electromagnetic Energy IF there
were working headlights.
Mechanical
Energy from
the motion of
the car, tires,
steering
wheel and
axels.
Sound Energy
from the
engine, tires,
and exhaust.
Wrap-up
energy is stored energy.
1. Potential
___________
mechanical
2. The energy that deals with motion is ___________
and ____________.
K.E.
electromagnetic
3. The energy that includes light is ______________.
position
4. Potential energy depends on the ____________
of
an object and its ____________
chemical
composition.
5. Kinetic energy depends on the ____________
and
mass
speed
____________
of an object.
6. In P.E., when referring to objects under pressure or
are stretched, it is called ____________
P.E.
elastic
Group Warm-up – 5 minutes
• Decide on 4 different forms of energy that can
be demonstrated in this room right now.
• One member from your group will randomly be
called on to get up and show your examples
and to explain why they are THAT FORM of
energy!
Warm-up
1. How can you trace the sound energy from a
normal car back to the Sun's energy?
2. How can you trace the burger you eat back
to the Sun's energy?
3. How can you trace using a a solar powered
cell phone charger back to the Sun's energy?