Crossword

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Across
  1. 3. a lever
  2. 4. the rate at which work is done
  3. 5. a double inclined plane that moves
  4. 9. a comparison of a machine’s work output with the work input
  5. 10. a simple machine consisting of two circular objects of different sizes
  6. 11. this occurs when a force causes an object to move in the direction of the force
  7. 12. the unit used to express power is joules per second or more commonly the _____
  8. 13. machines that are made of two or more simple machines
  9. 15. the work done by the machine
Down
  1. 1. this is the unit used to express work
  2. 2. a device that helps make work easier by changing the size or direction of a force
  3. 4. a simple machine consisting of grooved wheel that holds a rope or a cable
  4. 5. work formula
  5. 6. an inclined plane that is wrapped in a spiral
  6. 7. a simple machine consisting of a bar that pivots at a fixed point called a fulcrum
  7. 8. a simple machine that is a straight, slanted surface
  8. 10. the work you do on a machine
  9. 14. power formula