We are going to model a simple string guitar, analyze how sound moves through our model, and think about how the model relates to a telephone. Today we are going to learn more about how sound travels using a paper cup and string. Engineers are helping bring the world closer together by developing technologies that enable long-distance communication. One reason engineers learn about sound waves is to design things that help people talk to each other over long distances, like the telephone, cell phone, or the internet. If you wanted to say something to your friend on the other side of the playground, would your friend be better able to hear you through the air or through a solid? (Poll students.) We now know from experience that these sound waves sound louder when we hear them through solids. The sound wave actually moves the tiny particles, or molecules, that make up the solid. So when sound travels through a solid, it travels the same way as it does through air: in a sound wave. Refer to the slinky example in the associated lesson if more explanation is required.) (The answer is yes, tiny parts of the desk are moving with the sound wave. If you can hear a sound through your desk, does that mean your desk is moving? Take one minute to discuss with the people around you what is happening. Make sure they recognize that the sounds are louder with their ears to the desks.) Is there a difference? (Have a few students comment, one at a time. Now sit up and again scratch the desk surface. Have you ever noticed that you can hear sounds through solids? Everyone put your ear to you desk and scratch the surface with your fingernail. This activity works well accompanying a science unit on sound or waves. Students should be familiar with sound being described as a wave. String Telephones Worksheet (doc) Visit [ to print or download. International Technology and Engineering Educators Association - Technology Tests are often designed to identify failure points or difficulties, which suggest the elements of the design that need to be improved.Īlignment agreement: Thanks for your feedback! Different solutions need to be tested in order to determine which of them best solves the problem, given the criteria and the constraints. Plan and conduct an investigation collaboratively to produce data to serve as the basis for evidence, using fair tests in which variables are controlled and the number of trials considered.Īlignment agreement: Thanks for your feedback! This activity focuses on the following Three Dimensional Learning aspects of NGSS: Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved.Ĭlick to view other curriculum aligned to this Performance Expectation
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