Chapter 16. General definitions of vibrations and waves n Vibration: in a general sense, anything that switches back and forth, to and fro, side to side,

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Presentation transcript:

Chapter 16

General definitions of vibrations and waves n Vibration: in a general sense, anything that switches back and forth, to and fro, side to side, in and out, off and on, loud and soft, or up and down is vibrating. A vibration is a wiggle in time. n Wave: a wiggle in both space and time is a wave. A wave extends from one place to another. n Vibrations and waves: the source of all waves is something that is vibrating. Waves are propagations of vibrations throughout space.

1.VIBRATION OF A PENDULUM n n What does the period (T) depend upon? u u Length of the pendulum (l). u u Acceleration due to gravity (g). n n Period does not depend upon the bob mass or the amplitude of the swing. Vibration of a pendulum. The to-and- fro vibratory motion is also called oscillatory motion (or oscillation).

n n When oscillations are small, the motion is called simple harmonic motion (shm) and can be described by a simple sine curve.

Wave Properties Wavelength Wavelength, , is the distance between two consecutive peaks.

Wave Properties Amplitude Amplitude is the height of the wave above or below the equilibrium point.

Wave Properties Period The wave period, P, this the time it take one wave to pass the observer.

Wave Properties Frequency Frequency, f, is the number of waves passing a particular point in one second.

Examples of Frequency n What is the frequency of the second hand of a clock? Frequency = 1cycle/60 secPeriod = 60 sec n What is the frequency of US Presidential elections? Frequency = 1 election/4 yrsPeriod = 4 yrs

In symbolic form or

Wave Motion, Speed, Type  Waves transfer energy, not matter, from one place to another (A Vibrating source transfers a disturbance)  Speed depends on type of vibrating source and medium through which it travels  Wave speed… We know v = d/t υ = f x υ = f x  The same type of wave moves at the same speed regardless of f or  The same type of wave moves at the same speed regardless of f or  For any wave, f is inversely proportional to  For any wave, f is inversely proportional to

Wave Type Transverse waves vibrate across from direction of travel Longitudinal waves vibrate along the direction of travel (as in a spring)

Homework! n HW - n HW - Read 1-10 Complete page 26 (Packet) n Slinky Lab Tomorrow!!