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Notes 6.2: Circular Motion. Circular Motion – when a force causes an object to curve in a full circle. There are 2 types of circular motion to be familiar with: 1. Rotation – an object spins around an internal axis. Example: bike tire, figure skater

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Circular Motion – when a force causes an object to curve in a full circle.
  • There are 2 types of circular motion to be familiar with:
  • 1.Rotation – an object spins around an internal axis.
  • Example: bike tire, figure skater
  • Earth rotates once on it’s axis in 24 hours
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2. Revolution – object moves around an external axis
  • Example: rider on a carousel
  • Earth revolves around the sun
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We can describe circular speeds in 2 ways.
  • 1. Angular speed – rate at which something turns (rpm)
  • A CD spins at 200 rpm
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Example: A CD takes 0.3 seconds to make one revolution. If the radius of the CD is 6 cm, how fast is a speck of dust on the outside of the CD moving?
  • Answer:
  • t = 0.3 sec. v =(2πr)/t
  • r = 6cm = 0.06m v = (2 x 3.14 x .06)/0.3
  • v = ? v = 1.26 m/s