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Published byCamilla Holly Walton Modified over 9 years ago
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Physics is a drag!
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The force that resist motion Ff Measured in Newtons Acts parallel to the surface in contact Acts opposite to the direction of motion
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Depends on the nature of the materials in contact. Independent of speed or area of contact. Proportional to the force pressing the surfaces together (same as F N ) 2 kinds Static (stationary-force you must overcome to start moving) Kinetic (between surfaces that are moving)
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Symbol : µ A value that represent the amount of friction between 2 surfaces (no units) Calculated by taking F f /F N µ s : coefficient of static friction µ k : coefficient of kinetic friction To find Ff simply multiply µ by F N
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Fg FNFN FaFa FfFf F f = µF N F N = Fg but why? But how do you find Fg? Fg = mg =m(9.80m/s 2 )
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