Lecture 7 part II

Lecture 7 part II - PART II Contents EQUILIBRIUM IN THREE...

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21 PART II Contents EQUILIBRIUM IN THREE DIMENSIONS
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22 E QUILIBRIUM IN THREE DIMENSIONS A general three-dimensional system of forces F 1 , F 2, …, F n and couples C 1 , C 2, …, C n can be replaced by an equivalent system consisting of a system of noncoplanar, concurrent forces and a system of noncoplanar couples. The resultant R and C can be expressed as 0 xyz FFF =++ = ∑∑∑ Rij k 0 MMM = Cij k (7) Together we have six independent equations for the equilibrium. 000 === (8) Example 6.21
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24 E xample 6.23
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26 The reason for the moment of F x on x-axis is that since F x is parallel to the x-axis, the
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Lecture 7 part II - PART II Contents EQUILIBRIUM IN THREE...

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