Question

34. The displacement vector of a point with respect to origin is T = (3 î+29+3 î) m. A force vector
F = (
2-3 +4 î) N is acting at this point. Calculate its vector moment and moment of force.
(UPB 2010) Ans. 17 î - 69-13 î, 494 N m.

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Answer 1

Explanation:

Work done W=∫

F

.(dx

i

^

+dy

j

^

)

Work done W=∫

2

4

3x

2

dx+∫

3

6

2ydy

Or W=x

3

∣

∣

∣

∣

∣

2

4

+y

2

∣

∣

∣

∣

∣

3

6

Or W=4

3

−2

3

+6

2

−3

2

=85 J