lecture 2

# lecture 2 - Lecture 2 Vector vs Scalar Vector addition Unit...

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1 Lecture 2 Vector vs. Scalar Vector addition Unit vectors

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2 Vectors versus scalars: A vector is a quantity that has both a magnitude and a direction . A force is an example of a vector quantity. Vector magnitudes have units. A scalar is just a number usually with units (no direction). The mass of an object is an example of a scalar quantity.
3 Notation: Vector: F F F & or or The magnitude of a vector: . or or or F F F & F Scalar: m (not bold face; no arrow) The direction of vector might be “35 ° south of east”; “20 ° above the +x-axis”; or….

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4 To graphically represent a vector, draw a directed line segment. The length of the line can be used to represent the vector’s length or magnitude.
5 To add vectors graphically they must be placed “tip to tail”. The result ( F 1 + F 2 ) points from the tail of the first vector to the tip of the second vector. For collinear vectors F 1 F net F 2 F 1 F net F 2

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6 Vector Addition Vector Addition: Place the vectors tip to tail. A vector may
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lecture 2 - Lecture 2 Vector vs Scalar Vector addition Unit...

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