Download Energy PPT

Our BIG question:
HOW MUCH ENERGY IS IN AN
EARTHQUAKE ?
Energy
• The capacity to do work
• Or the ability to make change
• Work: the result of a force acting on a distance
The Joule
The unit for both work
and energy. (named after
James Prescott Joule)
Forms of Energy
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radiant (light) energy
chemical energy
mechanical energy
nuclear energy
electrical energy
heat (thermal) energy
energy of sound
Kinetic energy
Types of Energy
• Not to be confused
with forms of
energy!
• Kinetic Energy
energy associated
with motion.
• Potential Energy
stored energy.
Potential or Kinetic?
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radiant (light) energy
chemical energy
mechanical energy
nuclear energy
Gravitational energy
electrical energy
heat (thermal) energy
energy of sound
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Kinetic
Potential
Kinetic or Pot.
Potential
Potential
Kinetic or Pot.
Kinetic
Kinetic
What types of
energies does
she have?
What energy
conversions
are taking
place in
terms of the
woman?
What is the most important concept in
physics…perhaps?
Law of Conservation of Energy
Law of Conservation of Energy
• energy can change form, but it cannot be
created or destroyed.
– That means the total amount of energy stays the
same.
What powers you
to write all this
stuff down?
Law of Conservation of Energy
• energy can change form, but it cannot be
created or destroyed.
– That means the total amount of energy stays the
same.
Examples of Energy Transformations
Efficiency
• How much of the energy input goes into doing
useful work.
Which of these light
bulbs is more efficient?
What does it mean for a
car to be efficient?
Renewable Energies
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Solar
Hydro
Geothermal
Wind
Advantages of Renewable energy
• It can be used without depleting it
• No to minimal greenhouse gas emissions
Disadvantages
• Expensive – initial investment is high
• Difficult to generate quantities of energy
equal to traditional forms
• Reliability of supply can be unpredictable
rollercoaster
Rube-Goldberg machines
ok GO
honda commercial
Our BIG question:
HOW MUCH ENERGY IS IN AN
EARTHQUAKE ?