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Note3

# Note3 - "\$ Vectors Chapter 3 Vectors If a particle moves in...

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!"#"\$%%! & Vectors Ch 3 Chapter 3 Vectors ! If a particle moves in a straight line, we can describe its position with a single number x " we can keep track of direction by the sign ! For motion in 3D , there are >2 choices of direction 9/8/2009 Lecture 03 – Vectors 2 " we must then use a vector ! A vector quantity is something that has both a magnitude and a direction " 2 km N , 20 km/h S past the NCB ! By contrast, a scalar has only a magnitude (with sign) " 20 km/h , –24 °C Vector Addition/Subtraction ! We can think of a vector as a set of instructions : " go 2 km NW ! Since the starting point isn’t specified, it is easy to add vectors just move the beginning of the 9/8/2009 Lecture 03 – Vectors 3 " 2 nd vector to the end of the 1 st ! Subtraction is just adding the opposite

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!"#"\$%%! \$ Vector Components ! It is often useful to split the vector into two separate instructions: " go 1.414 km N, then 1.414 km W ! This is called resolving the vector into components 9/8/2009 Lecture 03 – Vectors 4 into components.
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