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m1 question watch

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    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,
    (ii) the direction of Q, giving your answer as a bearing.

    Can someone explain to me how to use the traingle method to work this question out
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    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.
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    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.
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    (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 ^_^
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    (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 !!
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    Maybe we should combine our explanations! :P
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    (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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