Khan Academy on a Stick
Spring potential energy example (mistake in math)
A spring, a frozen loop-d-loop and more! (See if you can find the mistake I made and get the right answer!)
If the above player doesn't work, you can try this direct link.
A spring, a frozen loop-d-loop and more! (See if you can find the mistake I made and get the right answer!)
If the above player doesn't work, you can try this direct link.