1. Chapter 9: Motion Section 1
Key terms: Motion, reference point, International System of Units, meter
Key concepts: When is an object in motion? How do scientists measure distance?

2. Describing motion
Motion – an object is in motion if its distance to another object is changing.
Reference point – a place or object used for comparison to determine if something is in motion
Relative motion – whether or not something is moving depends on its reference point. You may not be moving while sitting in class, but you are moving in reference to a fixed position in outer space.

3. Measuring distance
International System of Units – or SI units. Meters, cm, mm, etc
Science uses SI units because it is based in units of 10.

4. DO YOU KNOW ALL ABOUT MOTION NOW??????
‘Cause this section is done