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18.6_ Friction

# 18.6_ Friction - Force Couple Moment of Inertia Friction...

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Civil Engineering Moment of Inertia Moment of Inertia & & Friction Friction Compression Tension Force Couple I

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Civil Engineering Parallel Axis Theorem Example Parallel Axis Theorem Example Find I y Object Area x i d x I 0 I 0 + d x 2 A Rect Tri Circ
Civil Engineering Friction Friction

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Civil Engineering Theory of Theory of Dry (Coulomb) Friction Dry (Coulomb) Friction Friction arises from the interactions of the roughnesses (asperites) of the contacting surfaces.
Civil Engineering Theory of Theory of Dry (Coulomb) Friction Dry (Coulomb) Friction Maximum friction force between two plane, dry surfaces in contact that are not in motion relative to one another is: f=μ s N where μ s = coefficient of static friction N = normal force.

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Civil Engineering Theory of Theory of Dry (Coulomb) Friction (cont.) Dry (Coulomb) Friction (cont.) Friction forces act to oppose impending or relative motion.
Civil Engineering Some Typical Values of Some Typical Values of μ μ s s Metal on metal 0.15-0.20 Masonry on masonry 0.60-0.70

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