College Physics ›› 2022, Vol. 41 ›› Issue (1): 27-.doi: 10.16854 / j.cnki.1000-0712.210184

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Collision test of pure rolling double steel balls on wide and narrow rails

LU Jun-ling,GU Chen,REN Nai-jing,MA Bo-yi   

  1. Department of Physics,Tsinghua University,Beijing 100084,China
  • Received:2021-04-12 Revised:2021-05-27 Online:2022-01-20 Published:2022-01-13


A pure rolling double steel ball collision experiment is carried out on a wide

and narrow horizontal rails,and it is found that it is significantly different from the double

steel ball collision experiment in sliding motion; the reason is that the collision of the pure

rolling double steel ball is the frontal and tangential collision at the colli- sion point. The

two types of collisions obey different dynamic laws; after a collision,the motion state of the two

steel balls is no longer pure rolling. To return to pure rolling,each steel ball must pass through

the interaction between it- self and the guide rail. The effect is to go through a self-adjusting

stage; the energy loss in the self-adjusting stage is related to the rolling radius of the steel

ball and the deviation of its immediate state from pure rolling.

Key words: pure rolling, parallel rails, compound collision, kinetic energy loss, self-adjusting stage