A simple experiment is described concerning the vertical bounce of a nonspherical object. The object consisted of two golf balls joined together. The balls were dropped onto a heavy, rigid horizontal surface and were filmed with a video camera to measure the coefficient of restitution (COR). For spherical objects, the COR is usually defined in terms of the vertical speed of the centre of mass and can vary between zero and unity depending on the elastic properties of the object and the surface on which it bounces. For nonspherical objects, the COR is best defined in terms of the vertical speed of the contact point. For the two golf balls, the centre of mass COR was found to vary between −4 and +2 depending on the incident spin and the angle of inclination of the long axis. The contact point COR was found to be 0.8 0.2, regardless of the incident spin and angle of inclination.

描述了一个有关非球形物体垂直反弹的简单实验。物体由两个连接在一起的高尔夫球组成。将球掉到沉重的，刚性的水平表面上，并用摄像机进行拍摄，以测量恢复系数（COR）。对于球形物体，COR通常是根据质心的垂直速度定义的，并且可以根据物体及其弹回的表面的弹性特性在零到一之间变化。对于非球形物体，最好根据接触点的垂直速度定义COR。对于两个高尔夫球，根据入射旋转和长轴的倾斜角度，发现质心COR在-4和+2之间变化。发现接触点COR为0.8 0.2，