distance number standard meter second time motion speed 1. A measurement consists of a and unit. 2. Length is the between two points. 3. The SI unit of length is the 4. The SI of time is the 5. is the duration of an event. 6. is the change in position of an object with respect to a point of reference. 7. In order to compare measurements, they should relate to a 8 is a measure of how fast or slow an object is moving.