Skip to content

Course home

x
Sign up
x

Motion depends on the frame

Motion depends on the frame

Platform observer and train passenger in different frames of reference with relative velocities labelled

A frame of reference is the coordinate system and clock an observer uses to measure where and when events happen. When you quote a speed, you are always comparing it with some frame, such as the road, the Earth, or a train carriage.

Einstein's theory of special relativity (A-level only) Lesson

  1. A Level
  2. /Physics
  3. /Einstein's theory of special relativity (A-level only)

Step-by-step lessons on AQA A Level Physics Einstein's theory of special relativity (A-level only). Each one builds up to exam-style questions. Physics is one of the most mathematically demanding A Levels -- at least 40% of the marks require maths skills at Level 2 (GCSE) standard or above, so build calculation and graph-handling fluency alongside the conceptual content from the start.

Lessons