遠心力

${\displaystyle {\boldsymbol {F}}=-m{\boldsymbol {\omega }}\times ({\boldsymbol {\omega }}\times {\boldsymbol {r}})=m\omega ^{2}{\boldsymbol {r}}-m{\boldsymbol {\omega }}({\boldsymbol {\omega }}\cdot {\boldsymbol {r}})}$

${\displaystyle {\boldsymbol {F}}=m\omega ^{2}{\boldsymbol {r}}_{\perp }}$