I am planning to code two boxes, one top of another, so that I can simulate the motions as the top box moves.
However, I have no idea how to incorporate the center of gravity, when I am trying to use first moment of mass through Matlab.
Does anyone know how this would be possible through addition of codes or change? thank you
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Isn't the center of gravity just the average of the x edges and y edges? Yes, it is. So then you just have to draw and move the boxes, which you can do in the overlay if you use rectangle(), or plot(), or even line(). I'm sure you know how to move the x1, x2, y1, and y2 coordinates, so just increment them (however you do that, e.g. via the user interacting with a GUI), erase the old boxes, and draw the new boxes.
I think SimMechanics is the best choice for you to perform the dynamic anlysis. Also, if you have installed ADAMS or some other softwares (such as Maplesim, Dymola, etc.) which can provide dynamic anlysis, I think it takes only minutes to get what you want.