Collision Problem

Why am i halfway through the floor like this?

Too heavy?
No, I’m joking!
Try to enable the Bounds button, maybe?

i do, but then the thing shoots off the screen. ive tried to change the radius of the wheels and body, but nothing

try to change the center of the Object, maybe…

What bounds are you using? This looks like bounds aren’t enabled or sphere? Either way, try enabling convex hull bounds and raise the model about a foot from the floor; does the model start that low, if so the intersection may cause it to fly off. Otherwise, make sure any children of the physics object are set to ghost or more efficiently, no collision.