Question

forces acting on an object can be described as either balanced or unbalanced. if the forces acting on an object are balanced, then there will be no change in that objects speed or direction. if the forces acting on an object are, then there will be a change in that objects speed, direction, or both.

Explanation:

The text is about forces acting on an object. It first states that balanced forces result in no change in speed or direction. Then, by contrast, it implies that the opposite of balanced forces (which is unbalanced forces) would cause a change. Among the given options, 'unbalanced' is the appropriate term as it is the opposite of 'balanced' in the context of force - related motion changes.

Answer:

unbalanced