Galileo’s argument suggests that an unbalanced (external) force is required to change the motion of the marble, but no net force is needed to sustain its uniform motion.
What does Galileo’s argument suggest about the need for an unbalanced (external) force to sustain uniform motion?
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Galileo’s argument suggests that an unbalanced (external) force is not required to sustain uniform motion. He proposed that an object in motion will continue moving at a constant velocity in a straight line unless acted upon by an external force, such as friction, which counters its motion and causes a change in velocity.