To get the breaking effect yoiu are talking about you need to go to the dynamics menu then effects> shatter effects> menu ( the little square icon to the right of the shatter effects) From there you can select from 3 shatter options surface, solid, or crack. For a glass you would use surface shatter. From the surface shatter menu you can select the number of pieces you want your object to break into the jaggedness of the edges, the thickness of the pieces.ect ect.

Hope this helps.