b) Angular velocity

b) period and frequency of an object in circular motion

c) angular velocity ω, ω = 2π/T or ω = 2πf

for an object in circular motion

• period = time taken for an object to complete one revolution

• frequency = number of revolutions completed per unit time

angular velocity = rate of change of angle

ω = θ/t

• angular velocity (rads^-1) = change in angle (rad) / time (s)

ω = 2π/T

• angular velocity (rads^-1) = (2 × π) / period (s)

ω = 2πf

• angular velocity (rads^-1) = 2 × π × frequency (Hz)