10 - Friction

# 10 Friction - Friction For next time Read 6.1 6.2 Homework Chapter 5 32 40 46 Pre-test Moves at constant velocity Draw free body diagrams Moves at

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Friction For next time: Read: 6.1, 6.2 Homework: Chapter 5: 32, 40, 46

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Pre-test Moves at constant velocity!
Moves at constant velocity! Draw free body diagrams W E,R N C,R N F,C W E,C N R,C f F,C N P,C

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Which forces make up third law force pairs? N C,R N F,C Moves at constant velocity! N P,C f F,C W E,C N R,C W E,R W R,E
A return to “The crate in the snow” Compare the magnitude of the force by the snow on the crate to the magnitude of the force by the crate on the snow! A) greater B) smaller C) equal

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A return to “The crate in the snow” Newton’s 3 rd law N C,S ? N S,C
f F,C N F,C Friction: • Always acts parallel to the surface of contact (90 o to the Normal Force) • Comes in two flavors: static and kinetic • Static: no relative motion of surfaces • Kinetic: relative motion of surfaces (sliding)

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Kinetic friction • Magnitude of force depends on: – types of surfaces in contact – size of the normal force
Moves at constant velocity!

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## This note was uploaded on 04/13/2008 for the course PHYS 211 taught by Professor Shannon during the Spring '08 term at MSU Bozeman.

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10 Friction - Friction For next time Read 6.1 6.2 Homework Chapter 5 32 40 46 Pre-test Moves at constant velocity Draw free body diagrams Moves at

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