Transcript Types of Energy

Types of Energy
Y7 Environmental
Project
GEL 2007
QUESTION?
What do we need to move?
E N E R G Y
Where do we get this energy from?
F O O D
In fact …..
NOTHING
would
happen
without
ENERGY
What is Energy?
• Energy is the ability to cause change!
• Any type of activity will require some type
of energy
• Energy is either absorbed (taken in) or
emitted (given off) during a physical or
chemical change.
• Some Examples are: Heat, Sound, Light,
Chemical, Electrical, Solar, Mechanical
(motion)
• Most of the energy found on earth is due to
the influence of our sun!
Energy is always in a flux…
• Meaning it is always changing from
one form to another.
• This is an important law of nature
called:
• “Law of Conservation of Energy”
~ “You cannot create or destroy energy”
ENERGY IN ACTION: Kinetic
Mechanical ENERGY
ELECTRICAL ENERGY
SOUND ENERGY
HEAT & LIGHT ENERGY
STORED ENERGY: Potential
GRAVITATIONAL
ENERGY
CHEMICAL ENERGY
STRAIN ENERGY
NUCLEAR ENERGY
Quiz yourself: What type of energy is
the following?
• 1. Using a saw to cut a piece of wood in
half.
• 2. The explosion of fireworks.
• 3. The melting of an ice cube.
• 4. The glow of fluorescent light.
• 5. Boiling water on a stove.
• 6. Dropping a glass beaker onto the floor.
• 7. The sun’s rays
Answers for Kinds of Energy
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•
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•
•
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1.Mechanical, Sound,
2. Chemical, Heat, Light, Sound,
3. Heat, Mechanical
4. Heat, Light, electrical
5. Heat, light, (electrical or chemical for stove)
6. Gravitational to Mechanical, Sound
7. Solar, Heat, Light, Nuclear
Moving Molecules and
Thermodynamics
• Thermal (or Heat) energy can be either
taken in or given off from substances. The
amount of energy that is added or
removed changes the molecular motion.
• As you have learned, the molecules
speed determines the phase of Matter.
• Solids are slower/fixed; Gases are rapid;
• Liquids are in between: medium speed.
What happens if you increase
molecules in motion?
• If you continually increase the motion of a
solid, what happens to it?
• It will eventually become a liquid.
• If you continually increase the motion of a
liquid, what happens to it?
• It will eventually become a gas.
Cool
Hot
T
e
m
p
e
r
a
t
u
r
e
Bell Ringer: Draw the following graph
and put what line you think needs to be
in the graph.
Speed of particles
Group Lab Answers:
1. Flashlight: chemical energy (from the
battery) to light and heat energy
2. Food Clock: chemical energy (from the fruit)
to the electrodes that powers the clock
(electrical energy)
3. Newton’s Cradle: gravitational potential
energy when it is up high to mechanical
energy for the motion of the metal balls
4. Solar Cricket: A solar panel collect light
energy transfers it to a wire (electric energy)
& vibrates the cricket (mechanical energy)
Group Lab Answers:
5. Heat Sensor: a thermometer picks up the heat
energy in the substance through metal’s property
of conductivity.
6. The electric pencil sharpener: gets electrical
energy when plugged in and converts to
mechanical energy that powers the metal blades.
7. Rubber band: the rubber band can stretch and
gain strain energy and when released goes to
mechanical energy.
8. Radiometer: the white and black panels transfer
photons (solar particles: light/solar energy) which
powers the pinwheel inside to rotate around and
around (mechanical energy)