Our BIG question: HOW MUCH ENERGY IS IN AN EARTHQUAKE ?
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Transcript of Our BIG question: HOW MUCH ENERGY IS IN AN EARTHQUAKE ?
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Our BIG question:
HOW MUCH ENERGY IS IN AN
EARTHQUAKE ?
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Energy• The capacity to do work• Or the ability to make change• Work: the result of a force acting on a distance
The JouleThe unit for both work and energy. (named after James Prescott Joule)
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Forms of Energy
• radiant (light) energy• chemical energy• mechanical energy• nuclear energy• electrical energy• heat (thermal) energy• energy of sound• Kinetic energy
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Types of Energy
• Not to be confused with forms of energy!
• Kinetic Energy energy associated with motion.
• Potential Energy stored energy.
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Potential or Kinetic?
• radiant (light) energy • chemical energy• mechanical energy• nuclear energy• Gravitational energy• electrical energy• heat (thermal) energy• energy of sound
• Kinetic• Potential• Kinetic• Potential• Potential• Kinetic• Kinetic• Kinetic
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What types of energies does she have?
What energy conversions are taking place in terms of the woman?
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What is the most important concept in physics…perhaps?
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Law of Conservation of Energy
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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.
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What powers you to write all this
stuff down?
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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.
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Examples of Energy Transformations
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Efficiency
• How much of the energy input goes into doing useful work.
Which of these light bulbs is more efficient?
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What does it mean for a car to be efficient?
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Renewable Energies• 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
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ok GOhonda commercial
Rube-Goldberg machines