Microsoft PowerPoint - Knight Ch 6 - dynamics I notes

Microsoft PowerPoint - Knight Ch 6 - dynamics I notes - 1...

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Unformatted text preview: 1 Bodies in Equilibrium ( ___________ ) Remember this can occur if __________ or if v = ____________. Bodies in equilibrium, therefore, no ________ occurs Applying Newtons 2 rd law, We will usually break these problems into components such that, = = a m F r r = = F F y x r r Dynamics I -Chapter 6 Hints on Applying Newtons Laws Bodies in Equilibrium ( a = 0) STRATEGY: 1.Diagram and givens converted to standard units 2.Draw free body diagram, identifying the _________ direction 3.Resolve forces into x and y components 4.Use equations of equilibrium 5.Solve simultaneous equations for unknowns = = F and F y x r r Dont Stop Traffic! What is the tension in each wire if the traffic light weighs 20.0 N? Given: w = 20.0 N 1 = 30 o 2 = 40 o Wanted: T 1 , T 2 All units are in SI. Free body diagram: 1 = 30 o 2 = 40 o x y Dont Stop Traffic! Using the equilibrium equations 40 cos 30 cos 2 1 = + = o o T T r r A B . 20 643 . 500 . . 20 40 sin 30 sin . 20 sin sin 2 1 2 1 2 2 1 1 = + = = + = = + = N T T N T T N T T F o o y r r r r r r r = + = cos cos 2 2 1 1 T T F x r r r 766 . 866 . 2 1 = + = T T r r ____________ ______________ 2 Dont Stop Traffic! Solve for T 2 A 1 1 2 T 131 . 1 T 766 . 866 . T r r r = = N 3 . 16 T N . 20 T 23 . 1 N . 20 T 727 . T 500 . N . 20 ) T 131 . 1 ( 643 . T 500 . 1 1 1 1 1 1 = = = + = + r r r r r r Plug into B C Plug T 1 into C N 4 . 18 ) N 3 . 16 ( 131 . 1 T 2 = = r Hints on Applying Newtons Laws Bodies in non-equilibrium ( ______ ) Bodies feel a _____ force, therefore, motion occurs Applying Newtons 2 nd law, We will usually break these problems into components such that, In cases of motion, we often have to include _____________ in our calculations. = a m F r r y y x x a m F a m F = = r r r r ____________ Hints on Applying Newtons Laws Bodies in non-equilibrium ( a 0) STRATEGY: 1.Diagram and givens converted to standard units 2.Draw free body diagram, identifying the 2....
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This note was uploaded on 04/17/2008 for the course PHYSICS 122 taught by Professor Pope during the Spring '08 term at Clemson.

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Microsoft PowerPoint - Knight Ch 6 - dynamics I notes - 1...

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