Introduction
The goal of this activity is for students to identify and predict the effect of string tension, string length, and linear density of a string on the wave velocity through that string. From their investigation of one of these factors students will, as a class, construct a model that shows the relationship between these factors.
In the Preliminary Observations, students will observe a stringed instrument or hollow box with rubber bands across an open side. Students should identify a couple of factors that may influence the wave speed on the strings such as string tension, thickness/weight of string, and string length.
During their investigations, students will determine the relationship between one factor and wave speed. Since groups may be investigating different factors, you will need a class discussion after the investigations to summarize the class’s findings.
We recommended a specific equipment setup in order to narrow the focus of the investigation. However, students should be encouraged to consider other approaches that effectively isolate the variable of interest.
Objectives
- Design and perform an investigation.
- Draw a conclusion from evidence.
- Identify string tension and mass per unit length as the determining factors of wave speed on a string.
- Create a model for factors affecting wave speed on a string.
Sensors and Equipment
This experiment features the following sensors and equipment. Additional equipment may be required.
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This experiment is #27 of Physics Explorations and Projects. The experiment in the book includes student instructions as well as instructor information for set up, helpful hints, and sample graphs and data.
