4.4 Motion in a Plane

Last updated at June 30, 2026 by

šŸ’¬ Beyond a straight line

An overtaking car, a kicked ball, a satellite circling Earth — these move in a plane, not a straight line. What changes when motion is two-dimensional?

What is motion in a plane?
  • Motion in a plane — a vehicle overtaking another, the path of a kicked ball, or a satellite in a circular orbit — is called motion in two dimensions .
  • We now look at a special, important case of two-dimensional motion: circular motion.
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