If a bar of copper is brought near a magnet, the copper bar will be unaffected by the magnet.
The bowling ball would because it was bigger and even if they had the same speed the bowling ball still would contain the same force.
Newtons 3rd law of motion states the every action has an equal and opposite reaction, so in space with no gravity and no friction the ship would move in what ever direction it was pushed forever, until it would reach some kind of gravitational pull.
Hope this was right, =]
JT
Picture 1 and 2 or am I wrong and it's not that obvious.