Equilibrium of a Rigid Body under Coplanar Forces

Applied Mathematics — Second Secondary

The idea of equilibrium

A body is in equilibrium if it is at rest, or if it moves with constant velocity in a straight line.
In both cases the resultant of the forces acting on it is zero.
In this lesson the rigid body is treated as a particle, because all the forces acting on it pass through one point.
Therefore there is no turning effect to consider, and we only need to balance the forces.

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