Source code is included.
Center of Mass - In this applet your can locate up to 20 different objects, each of different mass and find the center of mass. Centripetal Acceleration - This is a simulation of the position of a car which is being driven at constant speed around a bend in the road. You can change the mass and speeds of each particle using the scrollbars. The bars at the top refer to the red particle, and those at the bottom to the blue particle. You can change the mass and speeds of each particle using the scrollbars.