Simple Harmonic Motion
Motion whose restoring force is proportional to the distance from rest.
Simple harmonic motion
The time for one full cycle.
Period
Sound waves are this type, consisting of compressions and rarefactions
Longitudinal
The change in heard frequency when a source moves toward or away from you.
The Doppler effect
The lowest resonant frequency of a string.
Fundamental frequency
At maximum stretch, spring force and acceleration are this.
Largest
How many cycles happen in a given time.
Frequency
A sound above 20,000 Hz.
Ultrasonic
If a siren comes toward you, the frequency you hear does this.
Increases
When a driving frequency matches the natural frequency and the motion grows.
Resonance
At equilibrium, force is smallest and this is largest.
Speed
A simple pendulum’s period depends on this property of the pendulum itself.
Length
A sound below 20 Hz.
Infrasonic
Loudness is measured in these units.
Decibels
The quality of a note that comes from mixed harmonics.
Timbre
Oscillations dying out because of friction.
Damping
Frequency and period are this of each other.
Reciprocals
The everyday name for a sound’s frequency.
Pitch
Two close pitches produce this "wah-wah" pulsing.
A beat
The membrane that turns air vibrations into mechanical motion.
The eardrum
The minus sign in Hooke’s law means the force points this way.
Toward rest (equilibrium)
A heavier bob does not change the period because extra pull is canceled by extra this.
Inertia
Sound is usually fastest in this phase of material.
A solid
Beat frequency is the difference between these.
The two frequencies
The coiled inner-ear structure that turns vibration into nerve signals.
The cochlea