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Force F=(3j - 4j + 12k)N acts at point A(1, -2, 3). Find - (i) Moment of force about origin (ii) Moment of forces about point B(2,1,2)m
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(i) YOA=1i2j+3k m

MFO=|ijk3412123|=i(4×3+2×12)j(3×31×12)+k(3×2+4×1)=12i+3j2kNm

  (ii) YBA=i3j+k m

MFB=|ijk3412131|=i(4+36)j(3+12)+k(94)=32i15j13kNm

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