Question

which is true of unbalanced forces? unbalanced forces will cause a change in motion. unbalanced forces are equal in size and direction. unbalanced forces action and reaction are equal.

Explanation:

Unbalanced forces have a non-zero net force, which causes a change in an object's motion (Newton's first law). Balanced forces are equal in size and opposite in direction, not unbalanced ones. Action-reaction pairs (Newton's third law) are equal but act on different objects, unrelated to being balanced/unbalanced.

Answer:

Unbalanced forces will cause a change in motion.