1. The material world
1. Mass

2. What is mass?
An indication of the amount of matter in a substance, calculated in kilograms(kg), grams(g) or milligrams(mg)

3. What is matter
A substance that occupies space and has a mass, all physical objects are made of matter, the smallest unit of matter is an atom
This Photo by Unknown Author is licensed under CC BY-SA

4. Mass vs Weight
Weight is the strength with which one object attracts another object. ( Gravity)
Your weight can change but not your mass. (moon vs earth)

5. Units of measurement for mass

6. How to measure mass?
P.18 Worlds