Lect07

# Lect07 - PHYS 172 Modern Mechanics Fall 2009 Lecture 7...

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Fall 2009 PHYS 172: Modern Mechanics Lecture 7 – Atomic Model of Solids, Circular Motion Read 4.1 – 4.13

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CLICKER QUESTION #1 Reading Question (Sections 4.1 – 4.13) (This is a closed-book quiz, no consulting with neighbors, etc.) Consider a brick at rest on a table top. Choose the correct statement: The normal force exerted by the table on the brick… a. …is mostly the result of stretching of the bonds between atoms near the surface of the table. b. …is mostly the result of compression of atomic bonds near the surface of the table. c. …insures that there is no deformation of the table surface, until the breaking point is approached. d. …does not affect the bonds between atoms in the brick.

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Today’s Lecture • Problem solving with the momentum principle • Atomic model of solids • Tension forces, bulk material properties
You throw a 0.2 kg ball into the air. Right after it leaves your hand, the ball’s velocity is <10, 10, 0> m/s. At this same instant, let the position of the ball be <0,0,0> m. We want to know the position of the ball after 0.5 second. 1. For this problem, what is the system? Let’s keep it simple and choose the ball as the system. (First, always draw a sketch of the problem.) 2. List the external objects that interact with the system. Make a diagram showing their interaction with the system. Carefully label the diagram. Objects:

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Lect07 - PHYS 172 Modern Mechanics Fall 2009 Lecture 7...

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