I learned about some very cool applets for math and physics from Dolores Gende the other day. These two pages and the applets were created by Walter Fendt.
An applet is an interactive animation (run with Java). These applets allow students to visualize and manipulate different things to explore and learn about the topics.
There are applets for arithmetic, algebra, geometry, trigonometry, forces, Newton's Laws, momentum and collisions, circular motion, waves, and much, much more.
These are great resources for teachers and students to use to better understand and explore these topics.
Applets on Mathematics
Applets on Physics