Unbalanced forces change an object's motion because they are needed to cause acceleration and alter the direction of motion.
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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