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# Lect_02 - What is a vector A scalar quantity is one that is...

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Lecture 2 Vectors. What is a vector? •A scalar quantity is one that is represented by a single number. (Eg: Mass, length, time, temperature, volume.) vector is a quantity which has both magnitude and direction. (Eg: Displacement, velocity, force.) Direction: something like “Makes an angle of 36 ° with the horizontal as measured CCW” Notation: A or A (or ) Magnitude (how long): | | or Equal vectors : Moving from P to Q, and from R to S: x Q x Q P x P x x S x S R x R x A B A = B Vector basics x Q x Q P x P x A -A Opposite vectors : Moving from P to Q, and from Q to P. Unit vector ( Â ): magnitude equals one. A = A Â Vector addition : Moving from P, to Q, to R x Q x Q P x P x x R x R A B C A B C = - C = + Vector subtraction : It’s an addition! B = +( ) Visually: What do I have to add to B to get A?

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ACT: Vector addition All the vectors below have the same magnitude. Which of the following arrangements will produce the largest resultant when the two vectors are added?
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Lect_02 - What is a vector A scalar quantity is one that is...

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