Transcript Document
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 • • • • • • • • 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 Rube-Goldberg machines ok GO honda commercial