# physics chp 12

## Terms

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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