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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.
In mechanics, a force is that which causes a change in velocity or, if you prefer, that which causes an acceleration. When more than one force acts on an object it is the net force that is important. Since force is a vector quantity, use geometry instead of arithmetic when combining forces.