1. Mass vs. Weight

2. Related, but not the same!
Definitions
Mass – Amount of stuff (matter) in an object
Weight – Force exerted on an object because of a planet’s gravity
Related, but not the same!
Mass ≠ Weight!

3. How to Find Mass
Use a balance ( units are g, kg)

4. How to Find Weight 1. Use a spring scale Calculate it!
W = mg, m= mass, g= gravity (9.8)

5. Weight Varies, Mass Does Not
If you move to a different location, the amount of stuff in you doesn’t change, so your mass is always the same.
BUT the force of gravity may be different, causing your weight to be different.

6. A Side-by-Side Comparison
Mass
Weight
Symbol m w
Unit
kilogram (kg) or gram (g)
Newton (N)
How to Determine
Use a balance
Use a spring scale
Constancy
Object has same mass everywhere
Object’s weight depends on location (planet, etc.)

7. Mass vs. Weight

8. What’s the difference?

9. A Song