Types of Equilibrium
Remember that we can think of any object as a rigid, massless shell with all its mass concentrated at the Center of Mass.
How does this effect the stability of an object?
If an object moves a little, what happens to its Center of Mass? Does it move up? Does it move down?
If a small movement lowers the CoM, the object is in unstable equilibrium.If a small movement raises the CoM, the object us in stable equilibrium.
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