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PHYS171_f11_lecture_14

# PHYS171_f11_lecture_14 - determined by direction of motion...

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PHYS171 Rm 1111, IPST building (building #085) Chapter 5 Resistive Force of an Object Moving Through Fluid Media velocity resistive force Large object moving rapidly through a gas or non-viscous fluid (car moving at high speed through air) Resistive force proportional to square of velocity 2 1 2 Av D R ρ = D is drag coefficient, is density of fluid, A is cross-sectional area Small object moving slowly through a viscous fluid Resistive force proportional to velocity v b R r r = b is a constant with units ???

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Chapter 5 Similar to friction, yet different from friction velocity resistive force Similar to kinetic friction •Resistive force does not exist until object begins to move. •Direction of resistive force is
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Unformatted text preview: determined by direction of motion. •Resistive force always opposes motion. Different from kinetic friction • Friction force is constant as long as object is moving. • Resistive force increases when velocity increases (depends on velocity). Chapter 5 Resistive Force Causes Falling Particles to Reach “Terminal Velocity” time velocity with resistance in vacuum v F =m g R Terminal velocity occurs when velocity is so high that the resistance ( R ) force balances the gravitational force ( F = m g ) Motion characterized by the value of the terminal velocity and time required to reach terminal velocity...
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PHYS171_f11_lecture_14 - determined by direction of motion...

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