Gravity defying structure Gravity is a force which pulls two objects towards one another. In our case, Earth’s gravity is responsible for keeping us on the ground, and making sure things fall down, instead of up. However, there exists other forces of pull that can defy gravity, which is what makes us think of floating and flying objects. In this activity, we will demonstrate one such force known as magnetic force. This is commonly seen through the use of magnets, such as the ones on whiteboards