If point C has acceleration components a C = ( a C x , a C y , a C z ) and point B has acceleration components a B = ( a B x , a B y , a B z ) then the acceleration of point C relative to point B is the difference between their components: a C / B = a C − − a B = ( a C x − − a B x , a C y − − a B y , a C z − − a B z )