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I Why does a football rotate?

  1. Apr 8, 2016 #1
    When a football is first thrown it is usually tip up but during the trajectory, the ball tends to rotate where the tip is pointing down. Why does this occur?
  2. jcsd
  3. Apr 8, 2016 #2


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    Google "ballistics"+"tractability."
  4. Apr 8, 2016 #3
    What does this mean?
  5. Apr 8, 2016 #4
    Never mind, I understand.
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