Can a spinning egg really jump?

T. Mitsui, K. Aihara, Chikako Terayama, H. Kobayashi, Y. Shimomura

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Simultaneous three-way observation of optical, acoustic and electric properties demonstrates a theoretical prediction that a spinning prolate spheroid can spontaneously lose contact with the table in the course of its rising motion when the contact friction is weak and the spin is large enough. The durations of the first loss of contact are measured for various initial spin rates and for three aspect ratios. The measurements show good agreements with numerical simulations. It is also visually shown that a spinning hard-boiled egg can jump.

Original languageEnglish
Pages (from-to)2896-2905
Number of pages10
JournalProceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Issue number2074
Publication statusPublished - 2006 Oct 8


  • Self-induced jumping
  • Spheroid
  • Spinning egg

ASJC Scopus subject areas

  • Mathematics(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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