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

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.

Frequency, f : #revolutions per unit time

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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)

v=2pr/T

v=2prf

### Fulcrums

• Moment Arm Distance – distance from the fulcrum

At static equilibrium

F₁d₁ = F₂d₂

### 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

• L = mvr

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