What this calculator does
This tool computes the centrifugal force and tangential (linear) velocity of an object moving in a circle. Enter the rotating object's mass, the radius of rotation, and the rotation speed, and it returns the force in newtons (N) and kilogram-force (kgf), plus the tangential velocity in m/s and km/h. The physics is universal SI mechanics and applies everywhere; no country-specific rules are involved.
How to use it
Pick units as you go. Mass can be entered in kilograms or grams; radius in metres, centimetres, or millimetres. For rotation speed, choose how your number is expressed: revolutions per second (rps), revolutions per minute (rpm), or radians per second (rad/s). The calculator converts everything to SI internally before computing.
The formula explained
First the rotation speed is normalised to an angular velocity omega in rad/s: for rps, \omega = 2π n; for rpm, \omega = 2π n/60; for rad/s, \omega = n. Then the tangential velocity is
Worked example: hammer throw
Take a 7.26 kg hammer swung at radius 2 m at 2 revolutions per second. Then
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