The factor Ae−ct/2m in Equation ??? is called the time–varying amplitude of the motion, the quantity ω1 is called the frequency, and T=2π/ω1 (which is the perio...The factor Ae−ct/2m in Equation ??? is called the time–varying amplitude of the motion, the quantity ω1 is called the frequency, and T=2π/ω1 (which is the period of the sine function in Equation ???) is called the quasi–period.