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Vector Functions Equations 

This page contains the full list of vector function equations including links to the pages where they are discussed and derived. Which equation you use will depend on the data you have to work with. We start by giving the variables and their names. 
Variables  

\(x(t),~y(t),~z(t)\)  
\(\vec{r}(t) = x(t)\vhat{i} + y(t)\vhat{j} + z(t)\vhat{k}\)  
vector function in terms of the arc length parameter, s 
\(\vec{r}(s) = x(s)\vhat{i} + y(s)\vhat{j} + z(s)\vhat{k}\)  
Note  If the variable s is used on this page, it refers to the arc length parameter.  
Equations  
\(\vec{v}(t) = \vec{r}'(t)\)  
\(\vec{a}(t) = \vec{v}'(t) = \vec{r}''(t)\)  
\(\displaystyle{ \vhat{T}(t) = \frac{\vec{r}'(t)}{ \ \vec{r}'(t) \ } }\)  
\(\displaystyle{ \vhat{T}(t) = \frac{\vec{v}(t)}{ \ \vec{v}(t) \ } }\)  
\(\displaystyle{ \vhat{N}(t) = \frac{d\vhat{T}/dt}{ \ d\vhat{T}/dt \ } }\)  
\( \vec{a}(t) = a_{\vhat{T}}\vhat{T} + a_{\vhat{N}}\vhat{N}\)  
\(a_{\vhat{T}} = \vec{a} \cdot \vhat{T} \)  
\(\displaystyle{a_{\vhat{T}} = \frac{\vec{a} \cdot \vec{v}}{\\vec{v}\} }\)  
\(a_{\vhat{T}} = \ \vec{v} \' \)  
\(a_{\vhat{N}} = \vec{a} \cdot \vhat{N} \)  
\(a_{\vhat{N}} = \\vec{v}\ \\vhat{T}'\\)  
\(\displaystyle{a_{\vhat{N}} = \frac{\\vec{v} \times \vec{a}\}{\\vec{v}\} }\)  
\(a_{\vhat{N}} = \sqrt{\\vec{a}\^2  a_{\vhat{T}}^2}\) 