The polybutadiene superball used,Figure 2, had a diameter of 4.8 ± 0.1cm, and a mass of 52.51 ± 0.01 g. The ball was released from a height of
0.860 ± 0.003 m beneath a fixed motion detector, as shown in Figure 3. A thread was attached to the ball, and the ball held by this to reduce any spin upon release.