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Question
Let a force `vec"F"=-"F"hat"k"` acts on the origin of Cartesian frame of reference. The moment of force about a point (1, -1) will be ______.
Options
`"F"(hat"i"-hat"j")`
`"F"(hat"i"+hat"j")`
`-"F"(hat"i"-hat"j")`
`-"F"(hat"i"+hat"j")`
MCQ
Fill in the Blanks
Solution
Let a force `vec"F"=-"F"hat"k"` acts on the origin of Cartesian frame of reference. The moment of force about a point (1, -1) will be `underline("F"(hat"i"+hat"j"))`.
Explanation:
`"F"=-"F"hat"k"`
P(1, -1)
`vecr=hat"i"-hat"j"`
`vectau=vecrxxvec"F"=abs[[hat"i",hat"j",hat"k"],[1,-1,0],[0,0,-"F"]]="F"vec"i"-hat"j"("-F")="F"(hat"i"+hat"j")`
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Inertial and Non-inertial Frames of Reference
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