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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