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Math Help - Finding the potential to draw phase planes

  1. #1
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    Finding the potential to draw phase planes

    I have that:

    theta(double dot)=-gsin(theta)/l where g and l are constants

    I worked the potential V(theta) out to be -mgcos(theta)/l by using Force=-deltaV

    but my notes say that V(theta)=1-cos(theta) and i have no idea how they got to that?
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  2. #2
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    Re: Finding the potential to draw phase planes

    Why did no one answer you last year???????
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