simple machines

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Across
  1. 1. how many simple machines are there?
  2. 2. a point that objects pivot on
  3. 5. what simple machine is a spiral staircase?
  4. 6. what simple machine is a seesaw?
  5. 7. the 2 types of fulcrums
Down
  1. 1. any device that makes work easier
  2. 3. what simple machine is a knife?
  3. 4. a beam or bar that pivots on a point