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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
1 Answer
written 3.9 years ago by |
(i) YOA=1i−2j+3k m
∴MFO=|ijk3−4121−23|=i(−4×3+2×12)−j(3×3−1×12)+k(−3×2+4×1)=12i+3j−2kNm
(ii) YBA=−i−3j+k m
∴MFB=|ijk3−412−1−31|=i(−4+36)−j(3+12)+k(−9−4)=32i−15j−13kNm