MACHINES

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Across
  1. 3. A quantity, usually expressed as a percentage, that measures the ratio of work output to work input in a machine.
  2. 4. The point on which a lever pivots.
  3. 7. A number that tells how many times a machine multiplies input force.
  4. 8. A device that helps do work by changing the magnitude and/or direction of an applied force.
Down
  1. 1. A simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects, and the axle is attached to the center of the wheel.
  2. 2. A simple machine that is a straight, slanted surface, which facilitates the raising of loads; a ramp.
  3. 5. A simple machine that consists of a bar that pivots at a fixed point called a fulcrum.
  4. 6. A simple machine that consists of a wheel over which a rope, chain, or wire passes.