Simple Machines

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Across
  1. 2. A rod used through the center of a wheel to transfer force
  2. 3. A triangular tool, often made of metal, that tapers to a thin edge.
  3. 5. A surface when inclined, can be used for raising heavy bodies.
  4. 7. A beam or board that rests on a support called a fulcrum.
Down
  1. 1. A fastener capable of being inserted into holes in assembled parts
  2. 4. A rotating circular machine that has teeth that mesh with another toothed part to transmit torque and speed.
  3. 5. A wheel that carries a flexible rope to transmit energy and motion.
  4. 6. A circular frame used with an axle to transfer force