Good online tutorial explaining the Gravity simulation in Solidworks?

[Elgin Clock]

I'm looking for somethng simple just to get the basics since I've never used the gravity simulation in SolidWorks before.

I've played around with it a bit this past week, but can't grasp the concept of how to make something simple work the way it should.
(Re: I click on things & experiment to fumble my way through it just to see if it would work, & it doesn't get me the results I want)
I'm guessing there are parameters I need to set to be able to simulate, but I don't know how.

Basically I want to reproduce what is shown here for now:
http://uk.youtube.com/watch?v=P6V-qlwqg6k

Very simple, straight to the point, 2 items interacting with each other as they would in real life.