For equilibrium of an extended body, the vector sum of all forces must be zero.

Name: For equilibrium of an extended body, the vector sum of all forces must be zero.
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For an extended body to be in equilibrium, not only must the vector sum of all forces acting on it be zero to ensure no net force, but the vector sum of all torques must also be zero to ensure no net rotational motion. This ensures both translational and rotational equilibrium.

For Equilibrium of an Extended Body, the Vector Sum of All