Gmod is an incredibly popular sandbox physics game without a doubt, but Gmod is not just a physics game.
As a matter of fact, something that becomes popular is often subject to some misconceptions as well, so the same is the case when talking about Gmod game. There’s no doubt that myths and facts about Gmod game abound!
In fact, Gmod is a sandbox game based on the engine that works using physics laws but Gmod is not a physics game.
A physics game is a kind of puzzle game. In order to accomplish puzzles, you need to make use of physics systematically provided to you in the game. On the other hand, there is no such thing in Gmod or Garry’s Mod.
With the above facts, it is obvious why you must not think Gmod of being a physics game instead of a sandbox physics game.