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## Summary:

- Question about dot product of vector and vectors time derivative from reading

## Main Question or Discussion Point

I'm reading Fundamentals of Astordynamics by Bate, Mueller, White and having trouble with this passage (pg15):

"2. Since in general

I don't think that this is the case. For instance in uniform circular motion

Would appreciate if anyone has some insight into this.

"2. Since in general

**a⋅a' =**a a'..."I don't think that this is the case. For instance in uniform circular motion

**r⋅r'**= 0.Would appreciate if anyone has some insight into this.