|Forces in Space, Gr. 6
Forces in Space is based on a NASA program in which toys were taken into space aboard a Space Shuttle mission in 1993.
NASA has a PDF with a writeup on conducting a thrust activity with a balloon which is a little different from the one done in this unit.
HowStuffWorks has some information about how microgravity works.
Find out what you would weigh on the moon or other planets at Age and Weight on Other Planets (you need to do the math) and then check your answers at the Astro Weight Calculator (which figures it for you).