Collision Simulator
Set the mass and velocity of two objects, then watch them collide elastically.
You might also find these useful
Complex Number PlaneMultiply two complex numbers and see how their magnitudes multiply and angles add on the plane.
Vector AdditionDrag two vectors and see their sum drawn as the diagonal of the parallelogram.
Golden RatioSee a rectangle divided again and again by the golden ratio, forming the classic spiral pattern.
Circular MotionAdjust radius and speed to see centripetal force and acceleration on an orbiting mass.