The vector sum of applied forces. To replace a force system on a rigid body by a single force, its line of action must also reproduce the original torque; a nonzero force couple cannot be replaced by one force.
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The resultant force is the single force that represents the combined effect of all the individual forces acting on an object. When multiple forces are applied to an object, they can either add together (in the same direction) or partially or completely cancel each other out (when acting in opposite directions). To determine the resultant force, you typically: 1. **Identify all acting forces**: Determine the magnitude and direction of each force acting on the object.