# Has this example something to do with vector projection?

Has this example something to do with vector projection?

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Can you please add a reference as to where you got this from? Regards – Amzoti Jan 8 '13 at 22:23
It is from this book. books.google.dk/… – Reader Jan 8 '13 at 22:25
Yes. The force $\textbf{F}$ can be given by $(\textbf{a} \bullet \hat{\textbf{b}}) \hat{\textbf{b}}$ where $\hat{\textbf{b}}$ is the unit vector in the direction of b. – Andrew D Jan 8 '13 at 22:26

Specifically, let $\bf{F}$ denote force, and $\hat{\bf{b}}$ denote the unit vector in the direction b. Then $$\bf{F} = (\bf{a} \bullet \hat{\bf{b}}) \hat{\bf{b}}.$$