1. 3.2 Weight, Gravity, and Friction
How does increasing the mass of the car affect its acceleration?

2. Key points
Gravity
Weight
Definition
Formula
Friction
Cause
Types

3. Gravity Force that pulls every mass toward every other mass.
Downward force
Depends on mass
Less on Mars
More on Earth
9.8 m/sec2

4. Weight Force created by gravity on an object Changes with location
Formula
If you have…
And you need…
Fw = mg
Mass and gravity
Weight
m = Fw / g
Weight and gravity
Mass
g = Fw / m
Weight and mass
Gravity

5. Friction
Forces caused by motion between objects (microscopic hills and valleys)
Work against motion that produces them
Reduces acceleration
All machines have
Types:
Air
Viscous
Sliding
Rolling