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Physics
Classical Physics
Mechanics
Equations of Motion: How Many Independent Equations?
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[QUOTE="haruspex, post: 6010585, member: 334404"] Assuming you mean a rigid body in equilibrium, count the potential accelerations. In 3D, the mass centre has three degrees of freedom for linear accelerations. That leaves rotational acceleration about the mass centre. In 3D, there are two degrees of freedom for the orientation of the net torque. But it does not have to be three linear force equations and two torque. There are other ways of getting five independent equations in 3D. E.g. in 2D, instead of two linear and one torque you could have one linear and two torque, provided the two torque axes do not lie on a line parallel to the linear force equation. Edit: I should have written "... do not lie on a line normal to the linear force equation". [/QUOTE]
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Physics
Classical Physics
Mechanics
Equations of Motion: How Many Independent Equations?
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