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Chapter 3 Vector Addition and Subtraction The addition of vectors is not the same as the addition of scalars Consider the vectors A and B The vector sum resultant R A B but R A B y Example A 50 0 m B 20 0 m R 70 0 m Use Pythagorean theorem R A2 B2 53 9 m B R A x Direction h y Use trigonometric functions x h cos y h sin y x tan x Three ways tan 1 B A 21 8 dimensionless cos 1 A R 21 8 or 21 7 for low precision sin 1 B R 21 8 Vector R 53 9 m 21 8
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