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Lecture 5

# Lecture 5 - Physics 110 Lesson 5 Announcements Homework 2...

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Physics 110 - Lesson 5 Announcements: Homework 2 - due Wednesday Discussion session alternative – contact TAs for appointment Textbook on 24-hr reserve at Circ. Desk at Bass Lib. use library computer for instructions - or - ask for monograph 1335 Today’s Lesson : Friction (finish Chapter 4) Newton’s Third Law Applications - Friction Why is it difficult to stop a car in the winter? Circular Motion (Chapter 5) Planetary Motion Keppler’s Laws Universal Gravitation

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End of Last Class - Rocket cart demo!! Think about: The cause of the motion & the forces! Why was there motion? Was there acceleration? Would this work in space? What were the forces?
Newton’s Third Law: “For every action there is an equal and opposite reaction” Forces can only occur in pairs Cannot produce a force without interacting What Provides the Reactive Force to: My Weight While Standing on a Table? A Push on a Chair? A Pull on a Rope? CAUTION: Action/reaction forces do not change motion!!! Action/reaction forces act on DIFFERENT objects. Demo - Air cart collisions.

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Newton’s Third Law - continued Action and Reaction Forces: note that ACTION is “when A exerts a force on B” the REACTION is “B exerts a force on A”