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 JouleThe unit for both work and energy. (named after James Prescott Joule)

Forms of Energy

• 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?

• 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

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• 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

ok GOhonda commercial

Rube-Goldberg machines