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An Archimedean spiral is traced by a point moving away from a pole

  • A.at a rate increasing geometrically with the angle
  • B.along a straight line at constant speed
  • C.around a circle of steadily increasing radius
  • D.at a uniform rate while the radius rotates uniformly

Answer: D

Correct answer: at a uniform rate while the radius rotates uniformly

Both motions are uniform, so the radius grows in proportion to the angle turned and successive turns of the spiral are evenly spaced. That even spacing is exactly the property a scroll cam needs to convert uniform rotation into uniform radial movement.

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