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M1 question - Moments help. watch

1. The force (3i-2j)N acts at a point A of a lamina where A has position vector (2i+3j)m relative to a fixed origin and the force (4i+3j)N acts at the point B of the lamina where B has position vector (3i-2j)m. Calculate the sum of the moments of these forces
B) about the point with position vector (4i-3j)m

2. (Original post by LilyKitty)
The force (3i-2j)N acts at a point A of a lamina where A has position vector (2i+3j)m relative to a fixed origin and the force (4i+3j)N acts at the point B of the lamina where B has position vector (3i-2j)m. Calculate the sum of the moments of these forces
B) about the point with position vector (4i-3j)m

Well, the moment of a force is given by , and the moments in your problem will just add.

Can you carry on?

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Updated: February 1, 2017
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