Relative motion

Summary: Figure 3 shows an example of relative motion. Relative motion means how fast one thing is travelling compared with another. For example, being on a moving train looking at a stationary (still) one feels the same as being on a stationary train looking at a moving one. Speed is relative. If two cars are moving at the same speed in the same direction, their relative speed is zero. We usually measure speed relative to the ground. Tags: science student-book-7 physics Created: 2026-05-21 Last Updated: 2026-05-21

Relative motion

Figure 3 shows an example of relative motion. Relative motion means how fast one thing is travelling compared with another. For example, being on a moving train looking at a stationary (still) one feels the same as being on a stationary train looking at a moving one. Speed is relative. If two cars are moving at the same speed in the same direction, their relative speed is zero. We usually measure speed relative to the ground.

Source

This concept is from the [Science Student Book 7](Science Student Book 7/Physics/Motion and Pressure/4.1 Speed.md), Physics section.