Khan/khan-exercises — pull request #30765 by fred3m (2012-09-25 04:21:36+00:00)
Title: Mechanics

Added an exercise to introduce projectile motion to grade school children. This is the first in a series of exercises I'm developing to teach some of the basic concepts of physics to children without using algebra or calculus.

There is also file mechanics.js that is meant to be the beginning of a physics engine that will be built up over time as the exercises become more complicated.