11+Vibrations+&+Waves

toc =Use www.physicsclassroom.com= to do this worksheet: http://www.physicsclassroom.com/getattachment/curriculum/waves/waves.pdf Test on this =Videos:= [] [] =Notes:= Mechanical energy is called E elastic ==

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The V above is Velocity


 * The formula for the period of a spring is:**
 * The formula for energy is:**
 * "A" is Amplitude.**
 * Formula for the speed of a spring**

Labs:
Lab 1 Lab 2 Lab 3 Lab 4
 * Work together to finish data. Do your own discussion/conclusions.**

Longitudinal and Transverse Wave Motion
Mechanical Waves are waves which propagate through a material medium (solid, liquid, or gas) at a wave speed which depends on the elastic and inertial properties of that medium. There are two basic types of wave motion for mechanical waves: ** longitudinal ** waves and ** transverse ** waves. The animations below demonstrate both types of wave and illustrate the difference between the motion of the wave and the motion of the particles in the medium through which the wave is travelling.

Longitudinal Waves
In a longitudinal wave the particle displacement is parallel to the direction of wave propagation. The animation below shows a one-dimensional longitudinal plane wave propagating down a tube. The particles do not move down the tube with the wave; they simply oscillate back and forth about their individual equilibrium positions. Pick a single particle and watch its motion. The wave is seen as the motion of the compressed region (ie, it is a pressure wave), which moves from left to right. To see a animations of spherical longitudinal waves check out:
 * [|Sound Radiation from Simple Sources]
 * [|Radiation from Cylindrical Sources]

Transverse Waves
In a transverse wave the particle displacement is perpendicular to the direction of wave propagation. The animation below shows a one-dimensional transverse plane wave propagating from left to right. The particles do not move along with the wave; they simply oscillate up and down about their individual equilibrium positions as the wave passes by. Pick a single particle and watch its motion. 

Water Waves
Water waves are an example of waves that involve a combination of both longitudinal and transverse motions. As a wave travels through the waver, the particles travel in // clockwise circles //. The radius ofthe circles decreases as the depth into the water increases. The movie below shows a water wave travelling from left to right in a region where the depth of the water is greater than the wavelength of the waves. I have identified two particles in **blue** to show that each particle indeed travels in a clockwise circle as the wave passes.

Discussions:
**re: 12 Vibrations** [|nchsfelderr] Chapter 12B Vibrations is a very easy section if you know where to look in the book. All the formulas you need to complete the online assignment are in Chapter 12(pg. 437). Remember all your units need to be in kg, m, N/m, and Hz. The PhET labs are straight forward just allow yourself a few days to complete them.

[|tinkzh920] Ch.12A Vibrations is an easy assignment. However, if you do not pay close attention to what the problem is asking and the info given, simple mistakes will be made. Be sure to pay close attention to the UNITS in each problem. Use CONVERSION FACTORS!!! Use formulas from pages 439,447,450 and 456. On questions dealing with the spring constant (etc.), check the direction of the force to determine if your answer is negative or positive. Allow yourself PLENTY OF TIME FOR THE LABS. They are very time consuming and you will need to read and analyze sections of the chapter in order to answer the questions. Also, answers to the Lab questions are found in Ch. 14-17. GOOD LUCK!!!! :D Shamiski Collier

[|abbycatheryn] -units must be in kg, m, N/m, and Hz -write down all of the formulas starting on page 439 -I had a lot of problems with the questions asking about spring constants (k) because of the directions so be sure to double check. -finish the packet early so you will have time for the labs...they will take about 3 or 4 days. it’s pretty easy so have fun

[|amr3363] Go ahead and write down all the formulas in the book because YOU WILL USE THEM ALL! check your units and make sure everything is in m. labs are a bit time consuming but can easily be done at home. this is the easier unit I have had so far. read the chapter in the book and try to understand it before you start the work (:

[|ncmarleer] I found Chapter 12 vibrations fairly easy. Make sure to pay attention to pay attention to all of your units because you can easily confuse them. You will use all of the formulas in the book which include formulas to find the spring constant, the period, speed of wave, frequency, and wavelength. Be sure to complete your assignment first so you will have plenty of time to do the PhET lab which is not difficult. In PhET, you will use waves on a string simulation, and Sound simulation if you are partner 1. Good luck!