lab 3.3
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lab 3.3
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 Texas A&M University
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 Phys 1401  COLLEGE PHYSICS 1
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Experiment 3 Newton s Second Law and the Atwood Machine This experiment will demonstrate the mechanical laws of motion using a simple assembly named the Atwood machine that is similar to that used by Rev George Atwood in 1784 to verify Newton s Second Law Materials Masking Tape 2 Paperclips Pulley 5 N Spring scale Stopwatch String Tape measure 15 Washers Procedure Part 1 1 Support the pulley so that objects hanging from it can descend to the floor Do this by tying a short piece of string to one of the pulley hooks Use a piece of masking tape to secure the string to a table top or door frame so that the pulley hangs plumb Figure 5 Note A higher pulley support will produce longer time intervals which are easier to measure 2 Thread a piece of string through the pulley so that you can attach washers to both ends of the string The string should be long enough for one set of washers to touch the ground with the other set near the pulley You may attach the washers using a paperclip or by tying them on 3 Use the spring scale to weigh the set of fifteen washers Divide the total mass by fifteen to find the average mass of a washer Record the total mass of the washers and average mass of one washer in Table 5 4 Attach seven washers to each end of the string 5 Observe how the washers on one side behave when you pull on the washers on the other side 2014 eScience Labs LLC All Rights Reserved 6 Add the remaining washer to one end of the string so one side of the string has seven washers M1 and the other has eight washers attached to it M2 Answer Post Lab Question 1 based on your observations 7 Place M1 on the floor Use the tape measure to measure the height that M2 is suspended while M1 is on the floor Measure the distance M2 will fall if you release the light set when it is in contact with the floor Record the distance in Table 5 8 Time how long it takes for M2 to reach the floor Repeat Steps 7 8 four more times five times total recording the values in Table 5 Calculate the
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