1. What are some differences between mass and weight? (at least 2)
Bell Ringer November 5, 2015
What are some differences between mass and weight? (at least 2)

2. Today Finish Test Work on Vocab while tests are being finished Notes
Homework

3. GOALS To explain the differences between mass and weight.
To calculate the weight of a given object when affected by differing gravitational forces.
Eureka Mass
Eureka Weight vs. Mass

4. Q: What are the differences between Mass and Weight?
Measured in grams
Tells how much matter is in an object (not affected by gravity!)
Also measures the inertia of an object
More mass = more inertia

5. Q: What are the differences between Mass and Weight?
Measured in NEWTONS
Tells us how much gravity affects the object

6. Q: What are the differences between Mass and Weight?
Mass and Weight are directly proportional to each other (assuming we are on the same planet in the same location)
This means if we double the mass of an object, we double the weight

7. Equation Triangle
We can convert between mass and weight using the following triangle. (Really, this is just Newton’s 2nd law!)
W = weight in N (aka Force)
m = mass in kg
**Make sure you have the
proper units BEFORE you
calculate!
g = acceleration due to gravity, 9.8 m/s2 on earth; changes if you go to a different planet! W m g
***1 kg = 2.2 lbs***

8. Homework
Parts 2 – 5 of pkt
If given a weight in lbs, you must first convert to kg using DA
Then plug mass into triangle formula to find weight in NEWTONS