speaking of physics, I was bored and figured out a way to make a physics catapult launch a person! It was pretty fun until the noobs swarmed it.
I was like "what? How did he- oh." I see how easy it is now.
If you can't see physics, then try spawning a Rocket Launcher, then shoot a brick or a few bricks.
If your computer can handle it, you should see physics. If you don't see any physics at all, then your computer isn't powerful enough.