The absolute difference between each set of values a. and am is fairly consistent. Experimental apBaratus errors: Force of friction in the pulley is a primary fsystematicJ
source of error, which is difficult to quantiflr. Stretching of the connecting string is accounted by recording the height for each set of masses. Measurement errors: positional measurements with meter stick, and time measurement with stop watch. Observer errors:
Height measurement variable fmeter stick not exactly vertical, estimated "last digit" of height measuremen! time measurement (reaction times to start/stop stopwatch) Lab 3: Atwood Machine mm/dd/20L1, Conclusion: By using Atwood's machine, Newton's law was successfully tested.
With this experiment, the measurement of acceleration of the masses was determined from the mass loads, and a value for the acceleration of gravity was calculated from time measurements. The results are in close agreement with the hypothesis that the acceleration
of the object observed being directly proportional to the net force acting on the object and inversely proportional to the total mass of the object. Though the data recorded was not completely accurate with the calculations conducted with Newton's 2nd Law
of Motion, the approximate values were within one standard deviation. Frictional force in the Atwood's machine and observer's reaction time are the 2 main sources of error. One improvement is to raise the apparatus so that the distance of fall is
larger and the measured fall time is increased. Reaction time errors (essentially constant) will be reduced as a percentage of the time measurements. Practical Applications: The Atwood machine has provided the design for many historical machines with the most obvious being
the elevator. The elevator uses a counterbalance, which relieves the driving motor from the load of holding the elevator. This causes it to overcome the difference in weight and inertia of both of the masses. Additionally, this same principle is used
in railways to connect cars on inclined tracks
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