equation, complete with the centrifugal force, m(‘+x)µ_2. And the third line of eq. (6.13) is the tangential F = ma equation, complete with the Coriolis force, ¡2mx_µ_. But never mind about this now. We’ll deal with rotating frames in Chapter 10.2 Remark: After writing down the E-L equations, it is always best to double-check them by trying