Endless belt
 

Spending time on my favorite baseball instructional swing forum Batspeed.com and found this:

http://www.maths.tcd.ie/~plynch/Swin...ependulum.html

You can restart it but if you watch the first drop you will see a constent hand swing (the middle point) and a accelerated end point.

Pretty cool- that is the endless belt effect.

a fun way to look at float loading