Numerical sim of a double pendulum with rainbow trail. Uses Euler's Method to simulate the motion of a double pendulum with variable masses, lengths, starting angles, starting velocities, and gravity. Users input all variables. (Try entering 1 for all if in doubt.) Used differential equations found at http://scienceworld.wolfram.com/physics/DoublePendulum.html. Unlike other double pendulum sims done in Scratch, this one is physically accurate. If yours doesn't use differential equations, it's not!
