1, v (linear velocity) =l/t=2πr/T(l stands for arc length, t stands for time and r stands for radius).

2.ω (angular velocity) =θ/t=2π/T(θ stands for angle or radian)

3.t (period) =2πr/v=2π/ω.

4.f (frequency) = 1/T

5、ω=2πn

6、v=rω

7.f direction (centripetal force) = mr ω 2 = mv 2/r = mr 4π 2/t 2.

8. Direction A (centripetal acceleration) = r ω 2 = v 2/r = r4π 2/t 2 = r4π 2n 2.