Final answer:
In physics, balanced forces keep objects at rest or in constant motion, while unbalanced forces lead to changes in motion.
Explanation:
Balanced force system: When forces acting on an object are equal in size and opposite in direction, they create a state of equilibrium. An example is a book sitting on a table where the force of gravity is balanced by the normal force from the table.
Unbalanced force system: In this scenario, forces acting on an object are unequal, causing a change in the object's motion. For example, a car accelerating on a road experiences unbalanced forces as the engine provides a forward force greater than the frictional force.
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