Physics Help Forum Statics: Resultant force

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Jan 27th 2011, 06:51 PM #1 Junior Member   Join Date: Jan 2011 Posts: 1 Statics: Resultant force I've been working on this problem for a while now and basically came down to 3 equations with 3 unknowns. 0=[(-2/7 F_b) + (2/7 F_c)] -F_r = [(-6/7 F_b) - (6/7 F_c)] 0= [(3/7 F_b) + (3/7 F_c) - 1500 N] Not sure how to go about this one. F_c, F_b, F_r ? Thanks
 Jan 27th 2011, 09:55 PM #2 Physics Team     Join Date: Jun 2010 Location: Mauritius Posts: 609 You can take the first and the last equation since then you deal with only two unknowns and two equations. You can use elimination, by first removing the fractions, ie. multiply throughout by 7, then the LCM of 2 and 3 is 6, multiply the first one by 3 and the last equation by 2 throughout. Add both to get F_b. Then solve for F_c, and used both to get F_r __________________ Jerry (Got my results!) It is easier to protect your feet with slippers than to cover the earth with carpet. No one can go back and change a bad beginning; but anyone can start now and create a successful ending. If a problem can be solved, no need to worry about it. If it cannot be solved what is the use of worrying?

 Tags force, resultant, statics

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