Frequency, f : #revolutions per unit time. f = revolutions / time Units: (1/sec)=sec -1 =Hertz (Hz) rpm (#rev/min) rps (#rev/sec). r. Period. Period T : time for 1 revolution Unit: sec, min, h For an oscillating spring For a pendulum /g). Relating Frequency and Period.
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At static equilibrium
F₁d₁ = F₂d₂
F₊=Fd at a right angle from the radius where d is the radius