How can I make a simple Pendulum movement

Hi,
I am quite new to motion and at the moment I am thinking that I am tiring to run before I can walk this idea of mine.
I am trying to make a repeating pendulum movement, like the movement of the Newtons cradle with the 4 balls, the energy of the swinging outer left ball is transferred to the outer right ball on contact etc. Each ball will show a short looping video footage.
Is there a simple way of creating an arced motion path (upwards and outwards) for the first ball and then reversing it along the same motion path, but then copying this path to the opposite side, mirroring the complete movement?
I have tried converting to a simple motion path to keyframes but I get into a bit of a mess.
Any ideas?
Thanks in advance.
PowerMac 2x2.5GHz Mac OS X (10.3.8)

I actually just did an animation based on that desk decor thing... it was easy once i figured out what to do...
Now, i tought myself motion, so my way may not be the "best" or quickest but it worked. First...import the object/make the object or whatever. second, go to behaviors and take basic motion path. After that, take the bezier curve adjustment and arc the line. That will get you the object going up in a swing or down...depending on where you put the start point on the curve. After that, copy the actual motion curve, but put the new end point to where the old start point was...basically invert the motion (if there is a simpler way to do this please tell me). that will get the object to go up/down then down/up.
So that gets the basic motion of a half swing.
If your object hits another object (like in the desk thing) make sure your snap lines are on because youll need them to line up the motion. Do the same thing to the second object as you did to the first, but going the oposite way. The snap lines will help guide you to make sure the second object goes as high as the first. To make it look correct i pretty much eyeballed the connection of one object to the next going frame by frame. I also added the "ease at end" motion to the rising motion path to add a realistic touch.
If this is confusing i'm sorry...

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