Hello everybody! I was read in a web page that magnetic field act over the ferromagnetic objects in the same way gravitational field act over any material object, mean magnetic field is a potential field energy as gravitational field. (http://van.physics.uiuc.edu/qa/listing.php?id=432") As you know, a gravitational field of a planet can be used to accelerate a space ship wich passes near by this field and have a certain speed that alow the motion of the ship to be changed by gravitation but also prevent the ship to fall to the planet. This action give an ammount of energy to the ship, increasing its speed. Now, because magnetic field behave on ferromagnetic materials similar as gravitational field on any material objects, mean is possible to use magnetic field to accelerate ferromagnetic objects, in the same way a gravitational field does with ships?