I think this is intuitively wrong for a vehicle with a gear wheel locked to geared track: the gears push against each other and acceleration would be possible e

I think this is intuitively wrong for a vehicle with a gear wheel locked to geared track: the gears push against each other and acceleration would be possible even in a zero g environment. Now, cars don't have gear wheels, but I assume the same principle applies. Edit - here's a more stringent discussion: http://physics.stackexchange.com/questions/75032/maximum-acceleration-for-wheel-driven-vehicle-from-standstill http://physics.stackexchange.com/questions/75032/maximum-acc...