What is dynamic friction


Under dynamic friction one generally understands the influence of objects that do not touch and still influence each other through their movement - their dynamics.

In astronomy, this effect plays an important role in the collision of galaxies (so-called. merging). There is no collision of individual stars, as it is very unlikely that one star will meet another. When star systems penetrate each other, dynamic friction occurs instead: when a star flies through other star systems, its mass exerts an attractive force on the surrounding objects; this leads to an increase in the density of stars behind the penetrating star, which slows it down in its movement.


  • Johannes Feitzinger: Galaxies. In: Ludwig Bergmann (Ed.): Experimental Physics Textbook. Vol. 8: Stars and space. 2nd, greatly expanded and updated edition. De Gruyter, Berlin 2002, pp. 299-438, here p. 315 f.

Categories:Astrophysical process

Status of information: 11/24/2020 11:39:45 AM CET

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