F08_lec14 - Lecture 14 Sep 29, 2008 P1112 Announcements...

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Unformatted text preview: Lecture 14 Sep 29, 2008 P1112 Announcements Prelim on Tuesday, Oct 7th, 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 More dynamics problems Accelerometer Dynamics of circular Motion accelerometer A ball of mass m hangs from a massless string of length L. The top of the string is accelerated to the right so that the string hangs at an angle . Calculate the magnitude of the acceleration. a L m ! Block F Wedge Block is placed on a wedge (neglect friction). A hand pushes the wedge with a force F. How large must the force be so that the block remains at constant height? A block of ass m is on the sloping side of a wedge of mass M and slope ngle , Lecture 8: Uniform Circular Motion v v arad arad arad v v2 = R arad ! Centripetal force: F = m arad Loop the loop Why does the car stay in contact with the track at the top? Which factors determine if the car stays in contact with the track? A R B Loop the Loop What is the minimum speed such that the ball stays in contact with the track? solution A: N W a y Fy = 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 : " Fy = N + W = ma v2 a= R N =0 v = gR Car going over bump How fast must the car go to become airborne? Summary Dynamics with curved motion aT=v2/R ap=d|v|/dt Leave surface: N=0 Bumps and loops ...
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This note was uploaded on 10/04/2008 for the course PHYS 1112 taught by Professor Leclair,a during the Fall '07 term at Cornell University (Engineering School).

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F08_lec14 - Lecture 14 Sep 29, 2008 P1112 Announcements...

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