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PCC PHY 103 - Experiment Pendums and Standing waves in a String

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ProcedureProcedurePhy 103: Fundamentals of Physics III 1Instructor: Tony ZableExperiment: Pendulums & Standing Waves in a StringObjectives:- To explore how mass and length affect the period of a simple pendulum- To explore the relationship between tension and wavelength for a standing wave in a stringPart 1: The period of a PendulumProcedure1. Set-up a simple pendulum as shown below. Tie a piece of string to a small mass (e.g. 100 grams). Attach other end of the string to a ring stand support. The length of the string should be about 0.6 m in lengtha. Record the value of the mass. M = ______ kg.b. Using a stopwatch, measure the time it takes for thependulum to swing to and fro 10 times.c. Divide this time by 10 (or the number of swings). Thisis the period for the pendulum.d. Record the period value in the table below.e. Shorten the length of the string and repeat themeasurement. Record your value below.f. Repeat 2 or 3 times.trial Length (m) Period (s)Questions:1. What is the relation between length of string and period?2. Using Graphical Analysis, create a graph of period (y-axis) vs. string length (x-axis). What is the shape of the graph?Ring standstringmassPhy 103: Fundamentals of Physics III 2Instructor: Tony Zable2. Attach different mass (50g or 200 g) to the string and adjust the length of the string to one of the values used above.a. Record the length of the string. L = ______mb. Using a stopwatch, measure the time it takes for the pendulum to swing to and fro 10 times.c. Divide this time by 10. This is the period for the pendulum.d. Record the period value in the table below.e. Attach a different mass to string and repeat the measurement. Record your value below.f. Repeat 2 or 3 times.trial Mass (kg) Period (s)Questions:1. What is the relation between mass of pendulum and period?2. Using Graphical Analysis, create a graph of period (y-axis) vs. mass (x-axis). What is the shape of the graph?Phy 103: Fundamentals of Physics III 3Instructor: Tony ZablePart 2: Standing waves in a string Procedure1. Set-up and clamp down a string vibrator. Attach a 2 different pieces of string (1-2 m) to the reed. Attach a spring scale (or force sensor, refer to next page) to the opposite end of one of thestrings.a. Vary the tension and attempt to obtain 2 or 3 different “standing waves in the string. Use a meter stick to measure the wavelengths and record the value with the scale readings.Trial Tension force (N) Wavelength (m) Wave Speed (m/s)b. What is the relationship between tension and wavelength?c. Using Graphical Analysis, create a graph of tension vs wavelength.d. The frequency of the vibrator is constant (f = 60 Hz). Calculate the wave speed for your values in the above table.e. So what does your answer in (b) say about the relationship between tension and wave speed in the string?Phy 103: Fundamentals of Physics III 4Instructor: Tony ZableTo use a force sensor:1. turn on the computer2. plug in dual range force sensor to CH1 on the LabPro3. set the sensor to the “10N” setting4. open LoggerPro software5. open the “Phy103-Lab01_Waves_in_a_String.xbl” experiment file. This file is located in thePHY103 network directory. Ask the instructor for assistance.6. Holding the force sensor in the direction you will take readings, with NO TENSION in the string, “zero” the sensor.7. Now, as you pull on the string, the tension in the string can be observed from the on screen


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PCC PHY 103 - Experiment Pendums and Standing waves in a String

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