General Physics(ppt) Ch 6

# General Physics(ppt) Ch 6 - Chapter 6 Friction Drag and...

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Chapter 6 Friction, Drag, and Centripetal Force Force causing centripetal acceleration r v m ma F r r 2 = = Σ The Conical Pendulum mg T = θ cos r v m ma T F r r 2 sin = = = Σ 2 Chapter 6 Friction, Drag, and Centripetal Force rg v tan = tan rg v = sin L r = tan sin Lg v =

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3 flat track F L 4 (注意 注意 注意 注意: 在徑向無 在徑向無 滑動 滑動 滑動)
5 From Newton’s second law F r =ma r 6 F y =ma y =0

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7 8
9 F F N 10 g

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F r =ma r n 11 F y =ma y n 12
Nonuniform Circular Motion t t ma mg F = = Σ θ sin dt dv g a t = = sin Chapter 6 Friction, Drag, and Centripetal Force R mv mg T F r 2 cos = - = Σ ) cos ( 2 g R v m T + = ) ( 2 g R v m T top top - = ) ( 2 g R v m T bot bot + = 驚人表演 14

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15 F y =ma y n 16
Motion in The Presence of Resistive Force v R (1). objects fall slowly through a liquid (2). very small objects (dust particles) move through air Chapter 6 Friction, Drag, and Centripetal Force 2 v R large objects (skydivers) move through air in free fall Resistive Force Proportional to Object Speed dt dv m ma bv mg = = - v m b g dt dv - = 0 = - t bv mg Chapter 6 Friction, Drag, and Centripetal Force b mg v t = terminal speed : ) 1 ( τ t

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General Physics(ppt) Ch 6 - Chapter 6 Friction Drag and...

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