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Homework Help: Why are situps harder with your legs straight?

  1. Nov 30, 2009 #1
    What proper "physics terminology" could I use to explain this?
     
  2. jcsd
  3. Dec 1, 2009 #2
    moments about a point. with your legs straight the force of your legs are acting at a further point away from ur body than they do when they are bent.
    moments = force * distance
     
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