Before Copernicus most people were thinking that the Earth is at center of universe. In 1609 Galileo observed sky through his home made telescope.
He found 4 moons orbiting Jupiter..It was a proof that bodies are orbiting other planets and not earth alone. <span>He found the crescent shape of Venus through his telescope and this could happen only if Sun is at center.</span>
Unless if all forces cancel each other out , the object will no longer be in equilibrium
It’s easier to lift the wheelbarrow when the load is near the front because there isn’t any pressure near the back where the handles are.