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A Constant Net Force Acting on an Object that is Free to Move will Produce a Constant, Every object in motion has a force acting on it. This force could be gravity or air resistance. The sum of these forces equals the total net force which is proportional to the mass of the object and its acceleration. Newton’s Second Law states that if there is no net external force acting on an object, all objects have constant velocity. It was discovered by Sir Isaac Newton who formulated three laws with his revolutionary discoveries in 1687-1689: (a) every action produces an equal but opposite reaction; (b) for every action there’s always some other part—even if not apparent at first glance—that is equal in size and opposite in direction; (c) every object has an attractive force that is called gravity. It was discovered by Sir Isaac Newton who formulated three laws with his revolutionary discoveries in 1687-1689: (a) every action produces an equal but opposite reaction; (b) for every action there’s always some other part—even if not apparent at first glance—that is equal in size and opposite in direction; (c) every object has an attractive force that is called gravity. If this net external force, or the sum of all forces on a system, can be shown to be zero then it follows as per Newton’s second law that the state of motion will remain constant. That