# Acceleration for a curved trajectory

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## Main Question or Discussion Point

In feynman lectures on physics volume 1
Excerpt 11-6
I don't get how the equation \begin{equation*} \Delta v_\perp=v\,\Delta\theta \end{equation*} is found.

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haushofer
Me neither, I don't have a copy of the Feynman lectures and don't have a clou what this all means.

Me neither, I don't have a copy of the Feynman lectures and don't have a clou what this all means.
They are available online.

Ibix
$\sin\Delta\theta\simeq\Delta\theta$ if $\Delta\theta<<1$, is the relevant fact, I think. Then the result follows from figure 11-8.