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# m1 question watch

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1. Two forces P and Q act on a particle. The force P has magnitude 7 N and acts due north. The
resultant of P and Q is a force of magnitude 10 N acting in a direction with bearing 120. Find
(i) the magnitude of Q,

Can someone explain to me how to use the traingle method to work this question out
2. well you can take them as vectors so you can make triangle with one side 7 one side 10, the angle between these two will be 120 and the last side Q. Then use erm Cosine rule to work out Q.
3. from any point on the page draw an arrow straight up to represent the force P. From the bottom of this arrow draw another arrow on a bearing of 120 to represent the resultant of P and Q. Draw the Final arrow that runs from the top of P to the top of the resultant of P and Q, label this Q. The rest is simple trigonometry.
4. (Original post by Mrm.)
from any point on the page draw an arrow straight up to represent the force P. From the bottom of this arrow draw another arrow on a bearing of 120 to represent the resultant of P and Q. Draw the Final arrow that runs from the top of P to the top of the resultant of P and Q, label this Q. The rest is simple trigonometry.
^ This is a better explanation ^_^
5. (Original post by Rohit93)
^ This is a better explanation ^_^
It is funny that you say that, because I rather liked the way that you said it, straight to the point !!
6. Maybe we should combine our explanations! :P
7. (Original post by Mrm.)
from any point on the page draw an arrow straight up to represent the force P. From the bottom of this arrow draw another arrow on a bearing of 120 to represent the resultant of P and Q. Draw the Final arrow that runs from the top of P to the top of the resultant of P and Q, label this Q. The rest is simple trigonometry.
Thanksss! I hadn't understood how to do this despite seeing many diagrams and such but that was a great explanation for one of the things I was confused about for M1! Ta

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