![]() 1.1 Range of values for e – treated as a constant.It can be more than 1 if there is an energy gain during the collision from a chemical reaction, a reduction in rotational energy, or another internal energy decrease that contributes to the post-collision velocity. The value is almost always less than 1 due to initial translational kinetic energy being lost to rotational kinetic energy, plastic deformation, and heat. It is measured in the Leeb rebound hardness test, expressed as 1000 times the COR, but it is only a valid COR for the test, not as a universal COR for the material being tested. A perfectly inelastic collision has a coefficient of 0, but a 0 value does not have to be perfectly inelastic. ![]() ![]() It normally ranges from 0 to 1 where 1 would be a perfectly elastic collision. The coefficient of restitution ( COR, also denoted by e), is the ratio of the final to initial relative speed between two objects after they collide. A bouncing ball captured with a stroboscopic flash at 25 images per second: Ignoring air resistance, the square root of the ratio of the height of one bounce to that of the preceding bounce gives the coefficient of restitution for the ball/surface impact.
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