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Homework Help: What are the physics involved a in backflip?

  1. May 27, 2010 #1
    On a dirt-bike in particular.
  2. jcsd
  3. May 27, 2010 #2
    I'd have to watch a video of someone doing it on a dirt bike, but for a person on a trampoline or similar, the act of tucking your knees in lowers your moment of inertia and allows you to rotate rapidly through your center of mass. This is the same type of thing as a ice skater bringing their arms in.
  4. May 27, 2010 #3
    That's the thing, on a dirtbike it's not possible to tuck your knees or anything.
    Here's a video link http://www.youtube.com/watch?v=iCYSZtV6ZvI&feature=related

    I notice that upon hitting the ramp, the nose of the bike is almost vertical, so a full rotation isn't done in the air.
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