Plus Magazine

Share this page
January 2004

Rugby and relativity: solution

Another situation where relative motions make judging ambiguous in sports is making offside decisions in soccer where the referee, linesman, receiving player, and the ball are all in relative motion. Very fast-moving games, like field hockey, try to alleviate the problem by having two referees, one for each half of the field.

diagram

Back to Outer space: Wagons Roll
Read more about...
  • Want facts and want them fast? Our Maths in a minute series explores key mathematical concepts in just a few words.