What do you mean by unbalanced force?

When one force is greater than another, the forces are not balanced, they are unbalanced. By applying an unbalanced force, you can change the motion of an object. Unbalanced forces can make an object at rest start moving, make a moving object stop, or change the direction and speed of the object.

A force where two forces acting in opposing directions on a body, are not equal in magnitude and in size, is known as an unbalanced force.

Explanation:

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b) charles darwin i learned that last year!