simple machines

123456
Across
  1. 3. a rigid bar resting on a pivot.
  2. 5. a plane inclined at an angle to horizontal.
  3. 6. sharp-pointed metal pin with a raised helical thread running around it and a slotted head.
Down
  1. 1. assembly formed by two disks, or cylinders, of different diameters mounted so they rotate together around the same axis.
  2. 2. a wheel with a grooved rim around which a cord passes.
  3. 4. that is driven between two objects.