simple machines

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Across
  1. 3. a piece of wood, metal, or some other material having one thick end and tapering to a thin edge, that is driven between two objects or parts of an object to secure or separate them.
  2. 5. plane a plane inclined at an angle to the horizontal.
  3. 7. and axle a simple lifting machine consisting of a rope which unwinds from a wheel on to a cylindrical drum or shaft joined to the wheel to provide mechanical advantage.
Down
  1. 1. a wheel with a grooved rim around which a cord passes. It acts to change the direction of a force applied to the cord and is chiefly used (typically in combination) to raise heavy weights.
  2. 2. a rigid bar resting on a pivot
  3. 4. a short, slender, sharp-pointed metal pin with a raised helical thread running around it and a slotted head, used to join things together by being rotated so that it pierces wood or other material and is held tightly in place.
  4. 6. a hand tool, power tool, or machine with a rotating cutting tip or reciprocating hammer or chisel, used for making holes.