1. Homework: Read 4.6-4.9 and be prepared for a brief quiz Tomorrow
Mass vs. Weight
Homework:
Read and be prepared for a brief quiz Tomorrow

2. Relationship between Mass and Weight
Mass and weight are related, but they are not the same.
Fw = mg
Ex. : Fw = (2 kg)(-10 m/s2)
= -20 N
In words: The force of weight equals mass times the acceleration due to gravity

3. Mass vs. Weight
You will be able to differentiate between mass and weight…
Apparent weight – force exerted by a scale
Weightlessness – an apparent weight of zero
W = Fg = mg

4. mass Weight
1 kg = 10 N

5. Example Problem:
Your mass is 75 kg. You stand on a scale in an elevator that is going up at 2.0 m/s2.
A) What is your weight (before entering the elevator)?
B) What is your apparent weight (on the elevator?
C) Is this larger, smaller, or equal to your weight at rest?