lecture06_Jan28

lecture06_Jan28 - More Application of Newtons Laws More...

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Page More Application of Newton ’s Laws s Laws z Review of Newton’s Laws of Motion z A Tour de Force Í Gravity Í Normal Force Í Tension Í Friction » static friction » kinetic friction » drag and terminal velocity Problem -solving with Newton solving with Newton ’s Laws s Laws General Strategy General Strategy
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Page Friction Friction New Topic Friction Friction z What does it do? Í It opposes motion! F APPLIED m g N x y y f FRICTION z How do we characterize this? Í Friction results in a force parallel to the surface, in a direction opposite to the direction of motion! Í Frictional force is perpendicular to N ormal force
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Page Friction. .. Friction. .. z Friction is caused by the “microscopic” interactions between the two surfaces: Sliding Friction Sliding Friction z The direction of the frictional force is parallel to the surface and perpendicular to the normal force N . z Frictional force f is proportional to the normal force N N . Í f = μ K N Í The “heavier” something is, the greater the friction will be…. makes sense! z The constant μ K is called the “coefficient of kinetic friction” .
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Page Sliding Friction. .. Sliding Friction. .. x direction: F f = ma y direction: N mg = 0 Friction f = μ K N so F μ K mg = ma or a = F/m - μ K g F m g N x y f
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This note was uploaded on 09/26/2010 for the course PHYS 021 taught by Professor Dick during the Spring '08 term at GWU.

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lecture06_Jan28 - More Application of Newtons Laws More...

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