When you kick a soccer ball across a field it will eventually come to a stop. does this prove or disprove newton's first law of motion? it disproves newton's first law of motion because gravity is stronger than friction. it proves newton's first law because friction is an unbalanced force. it proves newton's first law of motion because gravity slows the ball down. it disproves newton's first law of motion because an object in motion should stay in motion.