iKnowthat.com has multimedia educational games for kids ages 2-12.

Order Up Game

In this interactive, arcade style game, kids learn about gravity and projectile motion while having fun launching food in an outer space cafeteria.  Kids have to deliver food to customers who are sitting or moving around in the cafeteria.

Onscreen graphs depict the food projectile's path of motion.  Other important data is also displayed.  This game also helps kids learn how to use graphs and measurements in science.