Lecture_32web_2007

Lecture_32web_2007 - Quiet please ladies and gentlemen The...

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Unformatted text preview: Quiet please ladies and gentlemen The lecture is about to begin n Statics/Equilibrium For an object to be static it is necessary for: the net force on an object to be zero And the net torque on the object is zero x F = = We can use these three conditions to find the forces at different points on an object in equilibrium y F = A Printing press of mass 15,000kg sits on top of a wooden beam its centre of mass is 5m from the end of the beam. The beam is 20m long and has a mass of 1500kg, it sits on two uprights. What are the forces F1 and F2 on the beam due to the uprights Statics/Equilibrium 1500 g 15000 g 10 m 5 m 5 m 1 F 2 F Find F1 and F2 Statics/Equilibrium 1500 g 15000 g 10 m 5 m 5 m 1 F 2 F y F = ( 29 1 2 1500 15000 0 1 F F g g + - - = +ve 2 12000 F g = 1 12000 1500 15000 0 F g g g + - - = 1 1500 15000 12000 F g g g = + - 1 4500 F g = Find F1 and F2 Statics/Equilibrium 1500 g 15000 g 10 m 5 m 5 m 1 F 2 F y F = ( 29 1 2 1500 15000 0 1 F F g g + - - = x F = We can calculate the torque around any point on the object and it must be zero We must decide where, the pivot point is, and which direction of torque is...
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This note was uploaded on 04/07/2012 for the course PHYS 111 taught by Professor Dr.jackman during the Fall '07 term at Waterloo.

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Lecture_32web_2007 - Quiet please ladies and gentlemen The...

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