To calculate the torque caused by the buoyancy force I need the length and the angle but what angle should I use? Should I use the angle of from the center at the bottom of the angle from the center of mass?

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  • 1
    $\begingroup$ Both should result in the same answer since the distances are different. $\endgroup$
    – AJN
    Nov 1, 2022 at 1:25
  • $\begingroup$ Both the angle and the length is varying $\endgroup$
    – Babar
    Nov 1, 2022 at 8:12
  • $\begingroup$ Ohh you're right thanks $\endgroup$
    – Babar
    Nov 1, 2022 at 8:49

1 Answer 1


you should use angle 2. The buoyancy in this case is due to pressure from 3 sides. the 2 lateral sides undergo triangular pressure distribution that opposes each other and cancels.

Therefore the only effective force is the buoyancy pressure times the surface of the bottom, which is the applied force and is imparted at the center of the bottom of your submerged object.


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