lec6-1 - Differentiation of vectors In a Cartesian system,...

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Unformatted text preview: Differentiation of vectors In a Cartesian system, i , j , and k are fixed unit vectors If we have a vector ~ A = A x i + A y j + A z k , where the components are functions of t , then we can take a derivative d ~ A dt = dA x dt i + dA y dt j + dA z dt k For example, ~ A could be the position of a particle, and then the time derivative is the velocity. If ~ A is the velocity, then the time derivative is the acceleration. What do we do if the vector is described in another coordinate systems that does not have fixed unit vectors? Patrick K. Schelling Introduction to Theoretical Methods Differentiation of vectors in a polar system We can express ~ A in the xy-plane using unit vectors in a polar system ~ A = A x i + A y j = A r e r + A e The i and j unit vectors have a fixed direction, but e r and e do not Patrick K. Schelling Introduction to Theoretical Methods Unit vectors in polar coordinate system expressed in terms of Cartesian system We can easily see that, e r = cos i + sin j e =- sin i + cos...
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lec6-1 - Differentiation of vectors In a Cartesian system,...

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