Elastic pendulum worksheet

For some reason I was unable to put these replies to Valery Ochkov in the video section, so my comments below won't make sense unless you look there: http://communities.ptc.com/videos/3335

1. I don't believe in putting too much information in the animation - I find it distracting.

2. I get an occasional glitch in the video when viewed online (though it doesn't always happen). I never get a glitch with the original .avi on my PC.

3. I assumed a smooth drum so the total length of thread is stretched.

4. You want the worksheet Valery? C'mon, you can do elastic pendula and trajectories in your sleep!! Oh well, if you insist - see attached.

Alan