"Momentum, a function of mass and velocity, is conserved between the device's jaws. In layman's terms, 'Speedy thing goes in, speedy thing comes out.'
Very good! You are now in possession of the Aperture Science Ball Eater Device. With it, you can eat intra-dimensional balls and spit them out at very high speed. These balls have been proven to be completely safe. The Device, however, has not.