ECS221L2 - Statics of Particles Law of sines a sin = b sin...

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    Statics of Particles Law of sines a sin α = b sin β Law of cosines c 2 = a 2 + b 2 - 2ab cos γ b α β a γ c
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    Representation of a Force A force (P ) is defined by a point of application (A), a magnitude (P), and a direction (30 o from horizontal). 30 o 5N A
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    Force Resultants Parallelogram Law Note R = P +Q = Q +P but … R P+Q ! P Q R 4N 3N 5N
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    Some Vector Algebra negative of a vector subtraction R =P -Q =P +(-Q ) P Q -Q P P -P
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    Some More vector Algebra The sum of 3 vectors P
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