Lab_10 - Lab 10 The Pendulum Introduction In nature there are many physical phenomena that are repetitive for instance the motion of the planets

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Lab# 10 The Pendulum Introduction: In nature there are many physical phenomena that are repetitive, for instance the motion of the planets with respect to the sun and the oscillations of a pendulum. If a motion repeats itself after a time interval T, it is called periodic motion and is characterized by its period, T, and/or its frequency, f = 1/T. When a physical body in periodic motion moves back and forth over the same trajectory, it is called oscillatory motion. A simple pendulum consists of a mass m, suspended by a light string. If the suspended mass is pulled a little to one side and released, it will experience a restoring force (a force trying to push or pull it back to its equilibrium position) that causes it to swing back and forth, executing a periodic motion. The time that it takes the mass m to complete one full oscillation is called the period of the pendulum, T. Our objective in this experiment is to 1. Measure the period of pendulums of varying lengths, masses and amplitudes (displacements from equilibrium). 2. Determine the effect pendulum length, mass, and amplitude have on the pendulum’s period. Figure 1: Left the pendulum setup showing the set of three masses, the support rods, photogate and meter stick. Right shows the proper alignment of the pendulum's path and the photogate.
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Equipment: Photogate, LabPro Interface, “Lab#10 The Pendulum Software”, Excel Software, pendulum strings of lengths 50-35 and 20cm, three pendulum masses of 50-20-200g, stand, and a meter stick. Theory: A simple pendulum is a mass attached to a string, of negligible mass, and displaced from its equilibrium position by an angle θ , see Figure 2. When this is done the pendulum experiences a net restoring force (the component of the gravitational force tangent to the pendulum’s trajectory supplies this force). This force attempts to push or pull the pendulum back to its equilibrium position (hence the term restoring force). The pendulum’s inertia causes it to overshoot this position, this results in the pendulum executing periodic motion about its equilibrium position. Experiment:
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This note was uploaded on 02/29/2012 for the course PHYS 227 taught by Professor Rabe during the Fall '08 term at Rutgers.

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Lab_10 - Lab 10 The Pendulum Introduction In nature there are many physical phenomena that are repetitive for instance the motion of the planets

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