lec14 - the track at the top Which factors determine if the...

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Lecture 14 Feb 20, 2008 P112

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Announcements Prelim on Thursday, Feb 28, 7.30pm Bring: Your own Formula sheet (8.5x5.5) Single sided Non-graphing calculator Pen, protractor, ruler In past semesters students have regretted forgetting their protractor/ruler
Agenda for today Circular Motion

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Rotating frame: nonintertial QuickTimeª and a Road Pizza decompressor are needed to see this picture.
QuickTimeª and a TIFF (Uncompressed) decompressor are needed to see this picture. Hurricanes

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P112 Here we always work in inertial frames turntable
Loop the loop R A B

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Loop the loop Why does the ball stay in contact with

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Unformatted text preview: the track at the top? Which factors determine if the ball stays in contact with the track? Loop the Loop What is the minimum speed such that the ball stays in contact with the track? solution A: W N a y Σ F y = N + W = m a Loop the Loop What is the minimum speed such that the ball still stays in contact with the track? Ball falls if N = 0 The corresponding minimum speed is: A : F y = N + W = ma å a = v 2 R N = 0 v = gR Car going over bump How fast must the car go to become airborne? Summary Dynamics with curved motion a T =v 2 /R a p =d|v|/dt Bumps and loops Leave surface: N=0...
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lec14 - the track at the top Which factors determine if the...

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