有什麼公式可找出離心力是多少牛頓

There is an equation to calculate centripetal force (向心力), which is

F = mv^2/r
where F is the centripetal force (in Newton)
m is the mass of the object (in kg)
v is the speed of the object (in m/s)
r is the radius of the circle (in m)

Centrifugal force (離心力) is an intertia force (or psuedo force) that appears in a non-intertia system, such as a rotating system. You may apply the above equation to calculate its magnetude in the non-inertia system.