If it were possible to remove gravity and friction, think about what would happen to a football if it were tossed into the air. Assume the football is in a vacuum (no gravity or friction) and is continuously moving, which force(s) would be acting on the ball?

With gravity and friction absent, no net force acts on the football. Newton’s first law says that an object already in motion continues moving at a constant velocity unless a net force changes its motion. Therefore, no force is needed to keep the ball moving, which matches “No force is needed; an object in motion stays in motion.”

AI-written and checked against the verified answer.