Levers and gears

• what three parts make up a lever system?

  1. load
  2. effort
  3. pivot
• how can a lever be used as a force multiplier?

  if the distance between the effort and pivot is greater than the distance between the pivot and load, the force applied on the load is greater than the effort force. this is since the moment on both the effort and load must be the same.
• give an example of when a lever may be used to multiply a force

  a wrench, which has a long handle so that the force applied by the user is multiplied
• what determines the moment of a gear wheel?

  the size of the wheel
• describe the moment and speed of a larger gear being driven by a smaller gear

  the larger wheel will rotate more slowly but will also produce a larger moment