Doppler Effect
Set the source frequency and speed, then play to hear-see the pitch shift as it moves.
Approaching
482 Hz
Receding
405 Hz
You might also find these useful
Moment of InertiaCompare how a disk, ring, rod, or sphere resist rotation for the same mass and radius.
Lens ImagingMove an object and change the focal length to see where a lens forms its image.
Poisson DistributionAdjust the average event rate and see how the Poisson distribution shape changes.
Circular MotionAdjust radius and speed to see centripetal force and acceleration on an orbiting mass.