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Drops on a window

  1. Jan 13, 2006 #1

    daniel_i_l

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    Gold Member

    I was in a car on a rainy day and saw that the drops on the window were sliding down the window at about 45 deg. , I guess that that means that the force of the wind on the raindrops is about equal to the gravitational force but is that enough to calculate the speed of the car?
     
  2. jcsd
  3. Jan 13, 2006 #2

    russ_watters

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    Staff: Mentor

    Unfortunately, no: you need to know the force holding the drops to the window.
     
  4. Jan 13, 2006 #3

    DaveC426913

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    Gold Member

    Yes. That would affect friction. Friction alters wind drag but not gravity. Same with size/shape of raindrops. Will affect wind drag, but not gravity.
     
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