First of all I apologize if silly speculative discussions like this don't belong here. With that disclaimer out of the way, here's a fun thought experiment: Let's say an object, a cube that weighs 1kg rests on a rigid, level surface. And all of a sudden 99% of its mass disappears. What happens? Well, my thinking is, the cube is in equilibrium, so an equal amount of up and down force acts on it. Then 99% of the down force disappears in an instant and the cube is shot up, as if it had just bounced off. Is that anywhere near reasonable? What would the upwards force be? 0.99*9.8 newtons? How far up would it go?