Galileo’s thought experiment suggests that no net force is needed to sustain the uniform motion of the marble; an unbalanced (external) force is only required to change its motion.
What does Galileo’s thought experiment suggest about the need for an external force to sustain uniform motion?
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Galileo’s thought experiment suggests that an external force is not needed to sustain uniform motion. Once an object is in motion, it will continue moving at a constant velocity in a straight line unless acted upon by an external force, such as friction.