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Lect08

# Lect08 - PHYS 172 Modern Mechanics Spring 2012 EXAM 1 is...

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Spring 2012 PHYS 172: Modern Mechanics EXAM 1 is next week Time: 8:00-9:30 pm Wed Feb 8 Place: Elliott Hall Material: lectures 1-8, HW 1-8, Recitations 1-4, Labs 1-4 Lect. 8 - Rate of Change of Momentum Read 5.1-5.4 1 Problems: multiple choice, 10 questions (70 points) write-up part, hand graded (30 points) Equation sheet: provided with exam Practice exam + equation sheet: will be posted at the end of this week Note: no lecture on Thursday Feb 9!

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TODAY Forces on a System Changing Momentum Circular Motion 2
Rules for Identifying Forces on a System Choose "The System" Draw arrows for all forces due to objects in the surroundings that interact with The System. Objects that touch The System Objects that interact from a distance Label each force with the name of the object in the surroundings 3

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Example – Hanging Ball System: Ball Surroundings: Earth, Wire Free-body diagram ° F net = d ° p dt 4
Equilibrium with two strings net dp F dt = ° ° Static equilibrium ° F 1 Know mass.

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Lect08 - PHYS 172 Modern Mechanics Spring 2012 EXAM 1 is...

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