A force is only balanced when the net force is zero. Note that unbalanced forces causes a body to accelerate.
According to Newton's law, an object will only move when it is acted upon by an unbalanced force. Hence, if the forces acting on an object are balanced, it will not move. A flower pot sitting on a table has a zero net force acting on it.
When a leaf is falling to the ground, it is acted upon by an unbalanced force. Note that unbalanced forces causes a body to accelerate. If a body in motion is acted upon by balanced forces, the objects motion does not change.
The action of unbalanced forces leads to acceleration of a body or change in direction. Hence, when unbalanced forces act on an object that is in motion, the object can change speed, direction, or both. A force is only balanced when the net force is zero.
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