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m1 solomon paper c question 4 - heeelp!!

q) the force F1= (5i + 2j)N acts at the point A on a lamina where the position vector of A, relative to a fixed origin O, is (3i - 2j) m.

a) calculate the magnitude and the sense of the moment of the force about O. ((please answer this as simply as possible and could u please use a diagram if possible :smile:

)) (4)

Another force F2 = (pi + qj), acts at the point B with position vector (-i + 4j)m so that the resultant momentum of the two forces, F1 and F2 about O is zero.

Given also that the moment of F2 about A is 34 N s in a clockwise sense,

b) find the values of p and q
((please could u explain this simply too and a diagram where possible))

thank you

Reply 1

Jordan_U

Can anyone help me on this question?

Reply 2

Rakz14

2

Bump. I need some help on this too :frown:

Never seen a question like this.

Original post by Rakz14

Bump. I need some help on this too :frown:

Never seen a question like this.

Me too!! Im doing it now and this question is just...-_-

Reply 6

Rakz14

2

Original post by Gome44

Thank you soo much for this! Diagrams make it much more easier to understand :smile:

Reply 7

Rakz14

2

Original post by docwannabe

Me too!! Im doing it now and this question is just...-_-

Have a look at the diagrams above! Its starting to make more sense :smile:

Reply 8

Gome44

10

Original post by Rakz14

Thank you soo much for this! Diagrams make it much more easier to understand :smile:

No problem. Just remember a moment of a force is defined as "force multiplied by perpendicular distance along the line of action of the force." Thus, as in the diagram, you can just extend the force lines down, as you keep the line of action of the force. I can make the diagrams bigger if need be, i notice now they may be too small

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Reply 9

Gome44

10

Also, I doubt you'll get a question like this in the exam :smile:

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Reply 10

ChronicBoredom

3

Can anyone explain this more in depth? I hate vectors. I understand most of it but i dont know why youre doing it- like i dont get why youre including 1i and 4j as a moment. I thought it was just a position vector?

Reply 11

Atiq629

8

Original post by ash213

q) the force F1= (5i + 2j)N acts at the point A on a lamina where the position vector of A, relative to a fixed origin O, is (3i - 2j) m.

a) calculate the magnitude and the sense of the moment of the force about O. ((please answer this as simply as possible and could u please use a diagram if possible :smile:

)) (4)

Another force F2 = (pi + qj), acts at the point B with position vector (-i + 4j)m so that the resultant momentum of the two forces, F1 and F2 about O is zero.

Given also that the moment of F2 about A is 34 N s in a clockwise sense,

b) find the values of p and q
((please could u explain this simply too and a diagram where possible))

thank you

You'll never get asked a question like this in an edexcel exam for m1.

m1 solomon paper c question 4 - heeelp!!

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