objects not falling realistically I have modeled a screw(like a wood screw) and I want it to fall onto a rigid body plane.  When it falls it hits the plane and has a little bit of movement after that, but mostly stays in the same exact position, which is against all physics...I've pushed a bunch of buttons in the rigid body settings, nothing really helps.  Any suggestions?  Also, where is the option to 'multiply volume by mass'(I don't know if that will help, but I want to try.)  Thanks!
You probably have wrong Rigid body Collision shape, try changing it to mesh: