Simple Machines

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Across
  1. 3. Uses a fulcrum to play see saw
  2. 5. I got teeth that interlock to turn the next object
  3. 7. I'm an inclined plane wrapped around a cylinder
  4. 8. I Help to get from high to low or vice versa
Down
  1. 1. I'm the center to your balance
  2. 2. Man was able to get from A to B a lot faster
  3. 4. Let me get in here between your problems
  4. 6. Without the rope/chain, I can't lift anything