Motion requires a frame of reference, which is a system of objects that are not moving with respect to each other, to describe how objects are moving. Distance is the length of a path between two points and is measured in meters. Relative motion describes movement in relation to a frame of reference, such as people on a train platform observing the motion of a passing train relative to themselves.

1. Motion

2. How to Describe Motion There is one thing always needed when someone wants to talk about motion A Frame of Reference– a system of objects that are not moving with respect with one another

3. Distance Distance is the length of a path between two points The SI unit for distance is (m)

8. Relative Motion Is movement in relation to frame of reference Example People on a platform as a train passes by