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Chapter4 RESISTANCE

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Friction Forces Friction - a force that opposes motion of two solids or a solid and a fluid Static Friction (F static ) - a force required to start relative motion between two objects Kinetic Friction (F kinetic ) - the force required to maintain a constant speed between two surfaces in contact

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WHAT CAN BE DONE TO DECREASE THE AMOUNT OF FRICTION EXPERIENCED BY TWO OBJECTS?

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Static friction is usually greater than the kinetic friction. This is due in part as a result of how hard the surfaces are pressed together. This is called the normal force (F N )

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Coefficient of Friction ( μ ) The ratio of maximum force (static or kinetic) of friction to the normal force between the two surfaces in contact.

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Surface μSμS μKμK Wood on wood0.50.2 Wood on concrete0.60.4 Rubber on dry concrete0.80.7 Rubber on wet concrete0.650.57 Steel on steel (dry)0.780.58 Steel on steel (oiled)0.110.05 Steel on Teflon0.04

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Lab Preview A spring scale will be used to determine the pulling force required to get the sled to move?

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Determining Kinetic Coefficients of Friction

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Lab Preview SurfaceMass of Sled (kg) Mass Added (kg) Total Mass (kg) Weight of Sled and Mass (Newtons) Ivory on Dry Metal 0.08.250

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Lab Preview SurfaceKinetic Friction Force Normal ForceCoefficient of Kinetic Friction Ivory on Dry Material 0.422.53 μ K = (Kinetic Friction Force) / Normal Force

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