1. Bellwork: (Finish/Review)
Ch 3 Forces
Bellwork: (Finish/Review)
Newton’s Second Law of Motion Centripetal acceleration
Friction Centripetal force
Static Friction Newton’s Third Law of Motion
Sliding Friction Momentum
Air resistance
Gravity
Weight

2. What is wrong with this picture?

3. Balanced and Unbalanced Forces
Net force
Balanced Force
Unbalanced Force
What is the result of unbalanced forces?
How do unbalanced forces change velocity?

4. Friction What is friction and what causes it? Microwelds
What happens when two surfaces are pushed together?
Static friction
Sliding friction
Rolling friction

5. Air Resistance What is air resistance? What does it depend upon?
Examples
Why wouldn’t an apple and a feather fall at the same rate?

6. Terminal Velocity What is terminal velocity? Example
What does it depend on?

7. Newton’s Second Law
Definition What are force and acceleration related? How are mass and acceleration related? F = ma problems

8. Gravity
What is gravity? What happens if mass of object increases? What happens if objects move closer together? What are the four basic forces? Is gravity a long-range force? Does gravity ever completely disappear? Law of Universal Gravitation Weight vs mass Are astronauts really weightless? What causes floating in space? Free fall

10. Projectile Motion
What is a projectile and why do they follow a curved path? Can an object have horizontal and vertical motion? How do horizontal and vertical distance of thrown and dropped objects compare?

11. Centripetal Force
What is centripetal acceleration? What is centripetal force and what causes it? Traction How can gravity exert a centripetal force?

12. Newton’s Third Law
Definition Potential vs Kinetic Energy? What is rocket propulsion? Momentum What is it? P=mv Law of Conservation of Momentum