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Presentation transcript:

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

What is wrong with this picture?

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

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

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?

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

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

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

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?

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

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