Note that the conditions here assume no additional forces, like a
horizontal circle on a frictionless surface. For a vertical
circle, the speed and tension must vary.

Any of the data values may be changed. When finished with data
entry, click on the quantity you wish to calculate in the formula
above. Unit conversions will be carried out as you enter data, but
values will not be forced to be consistent until you click on the
desired quantity.

Calculation for: Radius r =
m = ft Mass =
m=kg = slugs Weight =
W=N = lbs Velocity =
v=m/s = ft/s or in common
highway speed units, velocity = km/h = mi/h

The centripetal
acceleration expression is obtained from analysis of constant speed circular
motion by the use of similar triangles. From the ratio of the sides of
the triangles: