What he did
He was an English scientist that developed the laws of gravity and motion. There were three laws of motion. His first law was an object in motion tends to stay in motion unless acted upon by an outside force, an object at rest tends to stay at rest unless acted upon by an outside force. His second law was F=ma, which is force is found by multiplying mass by acceleration. Newtons third law was for every action there is an equal and opposite reaction.
His Impact On The World
He changed how the world saw the universe. He put reasoning and logic together and helped other people understand the things around them. He explained why the moon revolves around the earth and no the other way around.(its because its the earth is much heavier) Knowing this helps because if you jumped off a high place your not going to float, you'll fall. Like if you jumped off a cliff you'll either be killed or you'll be seriously hurt due to gravity pulling you down.