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While using equations of circular motion why do we need to express all

  1. Sep 4, 2011 #1
    while using equations of circular motion why do we need to express all angles in radians?
     
  2. jcsd
  3. Sep 4, 2011 #2

    BruceW

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    Homework Helper

    Re: kinematics

    [itex] s = r \theta [/itex] (i.e. arc-length equals radius times angle) is only true when the angle is expressed in radians.
    In other words, we know that [itex]\pi[/itex] is a special number, such that the circumfrence equals [itex]2 \pi r [/itex] for any circle. And so we use radians to make use of this special number.
     
  4. Sep 4, 2011 #3
    Re: kinematics

    good..got it thanks
     
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