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## Glossary of physics chp 12

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simple harmonic motion
vibration about an equilibrium position in which a restoring force is proportional to the displacement from equilibrium
spring force formula
F=-kx
Whta does a greater value of the spring constant mean?
a stiffer spring becaue a greater force is needed to stretch or compress that spring
What are the SI units of k?
N/m
amplitude
maximum displacement from the equilibrium position
period
the time it takes to execute a complete cycle of motion
frequency
the number of cycles or vibrations per unit of time
relationship between frequency and perido
f=1/T or T=1/F
What does the period of a simple pendulum depend on?
pendulum length and free-fall acceleration
What does the period of a pendulum of for small amplitudes depend on?
not on the amplitude
formula for a period of a simple pendulum
period=2pi X square root of (length divided by free-fall acceleration)
What does the period of a mass-spring system depend on?
mass and spring constant
formula for period of a mass-spring system in simple harmonic motion
period=2pi X square root of (mass divided by spring constant)
medium
the material through which a disturbance travels
mechanical wave
a wave that propogates through a deformable., elastic medium
pulse wave
a single, nonperiodic disturbance
periodic wave
a wave whose source is some form of periodic motion
sine wave
a wave whose source vibrates with simple harmonic motion
transverse wave
a wave whose particles vibrate perpendicularly to the direction of wave motion
crest
highest point above the equilibrium position
trough
the lowest point below the equilibrium position
wavelength
the distane the wave travels during one cycle
What is parallel to the wave motion?
vibrations of a longitudinal wave
longitudinal wave
a wave whose particles vibrate parallel to the direction of wave motion
formula for speed of a wave
speed of a wave=frequency X wavelength
superposition
the combination of 2 overlapping waves
standing wave
a wave pattern that results when 2 waves of the same frequenc, wavelength, and amplitude travel in opposite directions and interfere
node
a point in a standing wave that always undergoes complete destructive interference and therefore is stationary
antinode
a point in a standing wave, halfway between two nodes, at which the largest amplitude occurs