Frequency f revolutions per unit time
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Frequency, f : #revolutions per unit time PowerPoint PPT Presentation


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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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Frequency, f : #revolutions per unit time

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Frequency f revolutions per unit time

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

  • Period T : time for 1 revolution

    • Unit: sec, min, h

      • For an oscillating spring

      • For a pendulum

        /g)


Relating frequency and period

Relating Frequency and Period


Tangential speed in terms of t or f

Tangential Speed in terms of T or f

v=2pr/T

v=2prf


Fulcrums

Fulcrums

  • Moment Arm Distance – distance from the fulcrum

    At static equilibrium

    F₁d₁ = F₂d₂


Torque

Torque

  • Force applied over a distance of rotation

  • Units: N*m

  • Example: wrench

    F₊=Fd at a right angle from the radius where d is the radius

    F₊=F sinө


Angular momentum

Angular Momentum

  • L = mvr

  • Linear momentum equals mass times velocity times the radius of the


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