Physics problems

Hi,

1) the 'mass' doesn't look to work. I tried 100kg bock against 0.0001, or 0kg small block, and the small block drops the big block. (I set the mass for the small one in the code)
2) when I set the object to be 'static' actor in the blender, it is not meant as a 'wall' (I can go through with the camera). however if I change it to be dynamic, I can move it with camera.

I don't know if these are bugs, or I missed something (I saw almost all video tutorials), please let me know,

thanks,
cheers