What is the definition of an unbalanced force?

Final answer:

An unbalanced force occurs when the forces acting on an object are not equal and opposite, causing a change in the object's motion. This is dictated by Newton's second law of motion. When forces are balanced, the object remains at rest or continues its motion unchanged.

Explanation:

An unbalancedforce refers to a scenario in which the forces acting on an object are not equal in magnitude and direction, causing a change in the motion of the object. In accordance with Newton's second law of motion, the motion change is directly proportional to the total unbalanced force and occurs in the direction of that force. Exceptionally, if the forces acting on an object are balanced, the object will either stay at rest or continue moving with a constant velocity, since the net force equals zero.

Consider this simple example to illustrate the principle. If you push a table to the right with a force of 10 Newtons and nothing pushes back with an identical force, the unbalanced force causes the table to move to the right. This is because there is an unbalanced force exerted upon it. Conversely, if an equal force of 10 Newtons is applied to the table from the opposite direction, these forces are balanced, and the table remains stationary because the net force is zero.

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