Machines

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Across
  1. 4. A spiral wonder, it turns to secure or lift
  2. 9. A rigid bar that rotates around a fixed point to lift or move objects
  3. 10. A sloping surface that reduces the force needed to lift an object
  4. 12. A combination of several simple machines working together
Down
  1. 1. Triangular tool, a force to be reckoned with
  2. 2. Two wheels unite, pedals in flight
  3. 3. Basic mechanical devices with few or no moving parts
  4. 5. Circular duo, one spins around the other, making movement smoother
  5. 6. A wheel with a grooved rim and a rope or chain passing over it to lift or move loads
  6. 7. A flat surface extending infinitely in all directions
  7. 8. A toothed wheel that meshes with another to transmit motion or change speed
  8. 11. Where the seesaw finds its center
  9. 13. Any device or system that helps perform work or accomplish a task