[IAEP] Gravity for Beginners...

[Jeff Elkner]

Hi All,

I'm working on a derivative version of "Gravity for 10 Year Olds" to
use with my high school age students, which I'm calling "Gravity for
Beginners":

https://docs.google.com/Doc?docid=0ARq50A7-FeDXZGd2MnN0ODJfMjAwNmc0NHF4ZHI&hl=en

Day 2 has the following:

"Show the students how to overlay frames from their videos to get this effect:"

Can anyone point me to easy instructions on how to do this?  I can't
really use the lesson without it.

Thanks!

jeff elkner