| 摘要 |
An accident reconstruction device is provided which allows for simple and accurate measurement of the coefficient of friction for a given surface. The device comprises a metal H-beam, I-shaped in vertical section, having a rubber tire tread affixed to its lower flange and a hole at one end positioned at the vertical center of mass of the device. The device is pulled along the surface to be tested by a scale which indicates the force required to move the device, thus allowing calculation of coefficient of friction for the surface. By turning the device over, the coefficient of friction between metal and the surface can also be determined by the same device, thus rendering the device particularly useful in determining a composite coefficient of friction for automobile accidents where an automobile has skidded over different surfaces, both on its tires and on metal portions of the automobile body.
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