try this:
import bpy, bpy_types
bpy.utils.unregister_class(bpy_types.bpy_types.SCENE_PT_physics)
for example to remove the gravity panel
By the way, such things can be discovered by using the console auto-complete CTRL+SPACE.
so, in the console (which you can show with [ctrl]+[F4]),
you first need to
import bpy_types
then
type bpy_types.bpy_types. and then ctrl+space to see a humongous list.