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LM 7_4 Vector Unit notation Collection

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Jul 14, 2022, 4:38:51 PM
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Oct 18, 2019, 1:17:59 AM
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7.4 Unit vector notation by Benjamin Crowell, Light and Matter  licensed under the Creative Commons Attribution-ShareAlike license.

7.4 Unit vector notation (optional)

 

When we want to specify a vector by its components, it can be cumbersome to have to write the algebra symbol for each component:

Δx=290km, Δy=230km

A more compact notation is to write

Δr=(290km)ˆx+(230km)ˆy,

where the vectors ˆx, ˆy, and ˆz, called the unit vectors, are defined as the vectors that have magnitude equal to 1 and directions lying along the x, y, and z axes. In speech, they are referred to as “x-hat” and so on.

A slightly different, and harder to remember, version of this notation is unfortunately more prevalent. In this version, the unit vectors are called ˆi, ˆj, and ˆk:

Δr=(290km)ˆi+(230km)ˆj.

7.4 Unit vector notation by Benjamin Crowell, Light and Matter  licensed under the Creative Commons Attribution-ShareAlike license.

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