# Damped Harmonic Lab

850 Words4 Pages
Perryon Worsham April 21, 2009 Damped Harmonic Motion Problem Statement: When and object moves back and forth, that is called periodic motion. Periodic motion because a force (or forces)is pulling on an object in attempt to return it to an equilibrium position. When this net restoring force is directly proportional to the objects displacement from the equilibrium position, then the resulting motion is called simple harmonic motion. However, in real oscillation systems, in addition to a restoring force there is also a retarding force. In this lab I hope to determine what happens to the period of the vibration, due to the retarding force. Hypothesis: When an object has bigger mass it tends to slow down faster compared to a an object with a smaller mass. In this lab I believe that the bigger retarding fore will make the period of the vibration decrease faster than the small retarding force. Variables: IV: Period Of vibration DV: Retarding force CV: Type of paper, measuring device, and size of paper UV: pulling the rubber bands at different lengths, human reflex with the cbl, and the wind in room blowing. Procedure: 1. Cut a piece of cardstock into the following squares: 4 and 16 . 2. Hang the spring from a horizontal rod that is clamped to a lab stand and place 100g mass on the spring. You want the spring to stretch 6-9cm from the mass. [If it does not, then choose another spring.] Make sure the distance from the mass to the UMD is at least 50cm. 3. Connect the UMD to the CBL and place the UMD directly below the mass so that it will record the up and down motion of the mass. 4. Tape the 4cm 4cm square to the bottom of the mass. 5. On the calculator, open the application “DATAMATE” and check that the reading in the upper right makes sense. 6. Gently pull the mass hanger down about 3 cm and then release (be very careful not to “overstretch” the
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