atwoods machine

# atwoods machine - Laboratory Report PHYS122L The Atwood's...

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Laboratory Report PHYS122L The Atwood’s Machine (Measurement of g) Purpose of the Experiment: To apply Newton’s laws of motion in a measurement of the acceleration due to gravity using a device called an Atwood’s machine and to determine its effectiveness. Experimental Procedure: A rotating pulley with a holder of mass M 1 attached at one end, and M 2 attached to the other is used to produce a velocity vs. time plot, derived from the photocell signal attached to the pulley, using the LabPro software. A mass m , much smaller than M 1 or M 2 , is attached to one holder. This holder is then positioned at the top of the pulley and then released until it hits the ground as the LabPro interface is collecting data. This process is repeated three more times and then the mass m is moved to the other holder. After collecting four values of acceleration for each holder, the mass m is then increased and these steps are repeated until we have four measurements from each holder for seven different values of m . The acceleration is computed by a = v(t) / t and the slope of the straight line that best fits this data is equal to {g / (M 2 + M 1 + I/R 2 )} where g is the acceleration due to gravity, M 1 and M 2 are the masses of the respective holders, and I/R 2 is the rotational inertia of the pulley. The measured accelerations for each side of the pulley of a given mass

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## This note was uploaded on 04/07/2008 for the course PHYS 122L taught by Professor Gougousi during the Spring '07 term at UMBC.

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atwoods machine - Laboratory Report PHYS122L The Atwood's...

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