Simple Machines

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Across
  1. 5. Also known as a ramp, is a flat supporting surface tilted at an angle, with one end higher than the other.
  2. 6. A central shaft for a rotating wheel or gear.
  3. 7. A triangular shaped tool, and is a portable inclined plane.
Down
  1. 1. A pulley is a wheel that carries a flexible rope on its rim.
  2. 2. A circular block of a hard and durable material at whose center has been bored a circular hole through which an axle is placed
  3. 3. It is machine that converts rotational motion into linear motion. It has a long and thin metal shaft with threads spiraling along it's length.
  4. 4. A simple machine consisting of a beam or rigid rod pivoted at a fixed hinge.