A unique pure mechanical system revealing dipole repulsion

June Haak Ee, Jungil Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We study multiple elastic collisions of a block and a ball against a rigid wall in one dimension. The complete trajectory of the block is solved as an analytic function of time. Near the turning point of the block the force carried by the ball is proportional to 1/x 3, where x is the distance between the wall and the block, in the limit that the block is sufficiently heavier than the ball. This is a unique pure mechanical system that reveals dipole-like repulsion.

Original languageEnglish
Pages (from-to)1078-1084
Number of pages7
JournalAmerican Journal of Physics
Issue number12
Publication statusPublished - 2012 Nov 29

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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