Crossword puzzle

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Across
  1. 5. force - The force applied to the machine (effort)
  2. 7. - A rigid bar or board that is free to move around a fixed point called a fulcrum.
  3. 8. machine - A device that helps reduce the amount of force required to do work.
  4. 9. - Comparison of the amount of energy put into a machine and the amount of energy put out by a machine.
Down
  1. 1. force - The force applied by the machine.
  2. 2. - A grooved wheel with a rope or cable wrapped around the groove.
  3. 3. plane - A sloping surface, like a ramp, that reduces the amount of force required to lift an object.
  4. 4. - Force exerted on an object that causes that object
  5. 6. machine - A machine made up of a combination of simple machines