PHYS171_f11_lecture_12

PHYS171_f11_lecture_12 - PHYS171 Principles of Physics I...

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PHYS171 Principles of Physics I Test was 1234 0% 14% 59% 28% 1. Too short 2. Just right 3. Too long 4. Way too long
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Aside from length, test was 1234 7% 3% 7% 83% 1. Easy 2. As expected 3. Unexpectedly difficult 4. impossible Chapter 5 Force of Friction on a surface Friction occurs when an object slides on a surface which is rough (on an atomic or macroscopic scale). Friction always opposes the transverse force exerted on an object. Static Friction – Frictional force which prevents an object from sliding on a surface. Dynamic Friction – Frictional force which tends to slow down an object which slides on a surface. Dynamic Friction force is independent of speed . m F r s f r g m r N r m F r d f r g m r N r motion N f k d μ = N f s s = (max value)
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Chapter 5 Force of Friction on a surface Static Friction – Frictional force which prevents an object from sliding on a surface. Dynamic Friction – Frictional force which tends to slow down an object which slides on a surface.
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This note was uploaded on 12/29/2011 for the course PHYSICS 171 taught by Professor La porta during the Fall '11 term at Maryland.

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PHYS171_f11_lecture_12 - PHYS171 Principles of Physics I...

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