
#19
Nov910, 02:24 PM

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P: 26,167

a constraint equation is a geometrical equation rather than a force equation … like a body being constrained to move along a particular surface, or in this case the free length of string being constrained to be connected to the position and rotation of the bodies 



#20
Nov910, 02:33 PM

P: 408

Ok but, I used that constraint equation already to find α to plug it into my torque equation...
The three equations are T+t=ma (Tt)r=Iα=0.5mr^{2}α A_{x}  C_{x} = k  rθ, so differentiating this twice I can solve for α. So I get T+t=ma_{cylinder}, and Tt=0.5m(a_{cylinder}a_{mass}), and then I'm stuck. 


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