Simple Machines

123456789101112
Across
  1. 3. one or more wheels with a grooved rim around which a string or rope can pass
  2. 7. symbol for output force
  3. 9. what the person using a machine does
  4. 11. the number that tells us how much a machine can multiply an input force
  5. 12. devices that multiply and/or change the direction of forces; devices that do work
Down
  1. 1. symbol is Wo
  2. 2. symbol is Di
  3. 4. a rigid plank that pivots on a fulcrum
  4. 5. the percentage of work input that can become useful work output
  5. 6. a solid wedge-shaped structure that a person can push an object up
  6. 8. what a machine does
  7. 10. symbol for work input