L7F11 - P123F11Lecture7 14October2011...

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P123 F11 Lecture 7 14 October 2011 Circular Motion and Circular Dynamics Review of Previous Lecture: Newton’s First Law: Newton’s Second law Resistive Force (I): Friction 0 ; 0 ) 0 const.; ( 0 0 i yi i xi F F v v a F 3 F 2 F 1 F y i yi x i xi ma F ma F a m F ; n T g m n T g m f || T n f || || max const. If 0 If ) ( T f v T f v n f n f k s s s k k
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i Clicker Only forces that at on crate B are included in the free body diagram for crate B
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mg Dv T 2 D mg v T Terminal velocity: NOTE: v T depends on mass Other Resistive Forces: Drag (in fluids) : Low Speed: f = kv High Speed: f = Dv 2 Example: Skydiver 2 Dv g m 2 T Dv g m eventually T v v t gt v v Free body Diagram:
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Recall the relationship of and along a curved path direction changing increasing v v a v a || a a v a 0 || a a v a || a v a direction changing constant v v direction changing decreasing v v 1 v 2 v s R R v v R s t s R v t v R v a v R v t s R v a t v 2 lim lim
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L7F11 - P123F11Lecture7 14October2011...

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