PPT-Vibrations and Waves Chapter 13

Hookes Law When a spring is stretched a restoring force is created The restoring force is proportional to the displacement The restoring force is always directed toward the equilibrium point. in electronic structure. Electronic . structure. . for. T=0. Sometimes. . considered. Effect. . of. zero-point . vibrations. . on . lattice. . parameters. I. ndirect. . impact. Zero-point . motion. WAves. A wiggle in time is a vibration. .. A wiggle in space and time is a wave.. A vibration can exist in one location, a wave cannot. A wave must travel from one place to another.. Vibration of a Pendulum. Doppler Effect. ~apparent change in frequency of a wave due to the motion of the source of the wave.. If the object is moving towards the observer the frequency will appear to increase. If the object is moving away from the observer the frequency will appear to decrease. Periodic Motion – any repeated motion with regular time intervals. Simple Harmonic Motion – vibration about an equilibrium position in which a restoring force is proportional to the displacement from equilibrium . Seismic . Waves. . are shock . waves . given off by earthquakes. . There are 2 types:. 1. . Body Waves. . originate from the . focus. (. F. ). travel . through. . the earth. . They’re used to locate . Benjamin Agyare, Stockton University & . Peter . Riseborough. (PhD), Temple University . ILMs are persistent vibrations of atoms in a homogeneous lattice which extend only over a finite region of space.. Benjamin Agyare, Stockton University & . Peter . Riseborough. (PhD), Temple University . ILMs are persistent vibrations of atoms in a homogeneous lattice which extend only over a finite region of space.. Before the waves are made the particles are same distance apart. While waves moves through the medium the particles . compress. together, then they spread further apart (stretched areas)- . rarefaction.. Learning Objectives. Understand what are vibrations and the risks they cause. Recognize symptoms and effects . Hand arm and whole body vibrations. Preventing and reducing injury. What is Vibration? . 2022-2023 Season. Russ Burleson. geaux15@hotmail.com. . 1. Agenda. Binder Check/Homework review. Mechanical Wave overview. Transverse Waves. Surface Waves. Longitudinal Waves (general). Sound Waves (Longitudinal). Energy is moving, not water. orbital motion. energy is transferred via circular motions. water (and gull) return to original position. the wave form moves forward. Motion decreases with depth. At. a depth of ½ of the wavelength, the motion is not significant.. ). Looking ahead: Midterm 2 Nov 18. (on . Chs. 9, 11, 13, 14, 15, 19, 20, 22 probably). . Vibrations. Some Preliminaries . Vibration = oscillation = anything that has a back-and-forth to it . Eg. . Draw a pen back and forth over the same line, repeatedly:. water. waves.... 4/5/2019. Physics 214 Fall 2010. 2. 1S-13 Slinky on Stand. Creating longitudinal compression waves in a slinky. What happens when you pull back and release one end of the slinky . ? . Earthquakes-Tsunamis. Graviational. attraction-Tides. Wind waves move energy, not matter. Wind waves- Growth. Wind strength- must be moving faster than waves. Wind duration-longer creates larger waves.