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From HalfLife 2 Knowledge Base

phys_pushscale 1 

This command controls how much "push" an object will recieve when struck by a bullet/knife/etc. Setting this to a negative will cause objects to move towards whatever pushed them.

phys_timescale 1 

This command manipulates the timing scale that the Source physics engine uses.

vcollide_wireframe 1 

This command draws physics object wireframes.

sv_massreport 

This handy tool will show the weight, mass, and comparitive weight of all visible entities on your screen! Very handy, in case you ever wanted to know how heavy that one object was.

sv_gravity 600 

This detirmines gravity. Change 600 with any to number to toy with gravity, 600 being default.