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Forces that are equal in size but opposite in direction are called balanced forces. Balanced forces will not change the motion or move an object at rest. On the other hand, forces that are not equal or opposite and do cause a change in the motion of an object are known as unbalanced forces. Continue Reading.
reaction force Force exerted in the opposite direction to an action force. resultant force The single force that could replace all the forces acting on an object, found by adding these together. If all the forces are balanced, the resultant force is zero.