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09_28_Third_Law

# 09_28_Third_Law - 9/28 2nd and 3rd Law Text Chapter 4...

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9/28 2nd and 3rd Law Text: Chapter 4 sections 3-5 Exam I…Done!!!! Just need to record Getting alphabetized now Can pickup after class I am Impressed, even if your score isn’t what you want!!!! Presentation Anyone? HW 9/28 “2nd and 3rd Law” due Wednesday 10/3 “Peer Guides” in Witmer Hall Monday!!!!!

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Example A book at rest has an acceleration of zero. W E,B N T,B Book The net force must be zero. The weight force is the mass of the book times 9.8 Newtons per kilogram. (9.8 N/kg) W = mg a = 0 In this case the magnitude of the two forces are the same.
Now I push down on the book How does the free body diagram change? W E,B N T,B Book N H,B a = 0 The normal force the table puts on the book had to get bigger!

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All forces come in pairs.  Here the car  pushes on the truck and the truck pushes  the opposite direction on the car,  with the  same size force! N
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09_28_Third_Law - 9/28 2nd and 3rd Law Text Chapter 4...

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