Lecture4 (1) - Lecture 4 Equilibrium(2D(Ch 4:1 4:4 web C...

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Lecture’4:’Equilibrium’(2D)’(Ch.’4:1-4:4,’web’C)’ Equa<ons’of’equilibrium;’reac<on’forces’&’couples’at’ supports’(2D);’free-body’diagram’ 1’ Equa<ons’of’equilibrium’ 1.’Sum’of’all’forces’equals’zero’ 2.’Sum’of’moments’of’all’forces’about’any’point’plus’the’sum’of’all’ couples’equals’zero’
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2’ Alterna<ve’sets’of’equilibrium’equa<ons’ I.’ II.’ F x = 0 M A = 0
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3’ Clicker’ques<on:’ Select’the’equa<on’that’represents’ the’equa<on’of’force’equilibrium’ in’the’x’direc<on’ A) Pcos45’–’Fcos45’+’100cos30’=’0’ B) -Pcos45’+’Fcos75’+’100cos30’=’0’ C) 100cos30’+’Fcos75’–’Pcos15’=’0’ D) -Pcos45’+’Fcos75’+’100’=’0’ E) None’of’the’above’
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4’ Reac<on’forces’and’couples’at’support’
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Lecture4 (1) - Lecture 4 Equilibrium(2D(Ch 4:1 4:4 web C...

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