Lecture_7

Lecture_7 - NewtonsFirstLaw F3 i F 0a 0 0(v const v 0 F1 F2...

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P123 Lecture 7 15 October 2010 Circular Motion and Circular Dynamic Circular Motion and Circular Dynamics Review of Previous Lecture: Newton’s First Law: ) 0 const.; ( 0 0 v v a F 3 F 0 ; 0 i yi i xi F F 2 F 1 F Newton’s Second law a m F n T Resistive Force (I): Friction y i yi x i xi ma F ma F ; g m n T f max ) ( n f n f s s k k g m || T n f || || const. If 0 If T f v T f v k s
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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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Other Resistive Forces: Drag (in fluids) : Low Speed: f = kv High Speed: f = Dv 2 Example: Skydiver Free body Diagram: 2 Dv 2 T Dv v mg Dv T 2 mg Terminal velocity: g m g m eventually D v T v gt v NOTE: v T depends on mass T v t
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Recall the relationship of and along a curved path v a v v v a a || a a a 0 || a a a || a changing increasing v changing constant v changing decreasing v direction v direction v direction v 2 v v s v 1 v v R s R v v 1 v 2 v s R t t t s R v a t v lim lim
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Lecture_7 - NewtonsFirstLaw F3 i F 0a 0 0(v const v 0 F1 F2...

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