Bouncing ping pong balls captured in flight over an extended time period producing a blurred image of the ball's location over time and also at various instantaneous times along the flight path using a whirling disk (with a slot cut along its radius) in front of the camera lens producing the stroboscopic effect at 15 "flashes" per second. The stroboscopic record allows easy visualization of the changes in velocity of the ball as it moved along its path.