Thursday, April 30, 2009

Energy

  1. Energy is a thing. This is a fuzzy notion, probably because of the way that we talk about newton-meters or joules. It is difficult to imagine an amount of an abstraction.
  2. The terms "energy" and "force" are interchangeable.
  3. From the non-scientific point of view, "work" is synonymous with "labor". It is hard to convince someone that more work is probably being done playing football for one hour than studying an hour for a quiz.
  4. An object at rest has no energy.
  5. The only type of potential energy is gravitational.
  6. Gravitational potential energy depends only on the height of an object.
  7. Doubling the speed of a moving object doubles the kinetic energy.
  8. Energy can be changed completely from one form to another (no energy losses).
  9. Things "use up" energy.
  10. Energy is confined to some particular origin, such as what we get from food or what the electric company sells.
  11. Energy is truly lost in many energy transformations.
  12. There is no relationship between matter and energy.
  13. If energy is conserved, why are we running out of it?


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