Final answer:
Unbalanced forces change an object's motion because they are needed to cause acceleration and alter the direction of motion.
Explanation:
True, since the natural state of all objects is to be at rest. Eventually, all objects will be at rest, so to keep an object moving, a force needs to be applied.
Changes in velocity are detectable and are evidence of unbalanced forces acting on an object.
When two unequal forces act on a body, the body will not move in the direction of the weaker force. This is because an unbalanced force is needed to change an object's motion.
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