students, TAs and faculty instructors can post anything which are related to the class here.

The first one, Khanacademy.org is just a website built by a guy who received 3 different degrees from MIT, and then an MBA from Harvard. He's made several thousand videos over the past few years that cover everything from corporate finance, to biology, chemistry, organic chemistry, trigonometry, calculus, linear algebra (and just about every other level of math there is), art history, astronomy, and of course physics. And those cover a pretty full range of topics from kinematics, projectile motion, fluids, circuits, thermodynamics, etc. Videos average about just 10 minutes, but will push up to 25-30 minutes for more complicated subjects like linear algebra. It seems to me that the guy just has a natural talent for communicating. Calculus for example is not hard to learn, but unfortunately for the instructors, it's hard to teach because of how obscure many of the concepts can be when first presented. I've noticed that most people feel that once you finally understand what the calculus teacher is trying to convey, it's suddenly so easy that it's more tedious than anything, and you feel like an idiot for not grasping it sooner. Case in point, on almost every video I've watched of calculus I see comments at the bottom from kids in like the 7th grade, even one made by a 12 year old, who were watching the videos and grasping, with ease, the same concepts that so many of my university peers in the 8am calc class are having to work at. And if nothing else, it's great remedial education for those who are out of practice and need a refresher.

The second, physics-online.com, just has a wide array of interactive modules that seem to cover almost every subject in basic physics. And as I said before, at least for me, it's the simple act of repetition that does it. Often times, just by doing something I can learn it even if I've never had any formal education and lack any prior knowledge. But the real value, especially given that the FREE lite-version (which gives you everything you need anyway), is in the visualization. Looking at a collection of letters and Greek symbols pieced together into a formula on a chalk board is much harder to interpret and internalized than the picture of a cannon shooting a ball at an initial velocity any angle you choose, while plotting the trajectory in flight and showing you how the vectors change. So what I do is just click and set random values without looking at the screen and then based on how far it went or the angle I set, or whatever variable I decide to play with, I try to see if I can calculate the remaining variables.

But another thing that I thought you might be interested is one of its features called “Mechanics Pad”. It's an interactive module where you can literally design your own mechanical system with pulleys, gears, levers, vectors, or it seems just about any other mechanical system you can imagine. I've yet to really explore it, but it seems like that could probably be useful for something.