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Lab 5:
Uniform Circular Motion
Elliot Blau
Lab Partner: Taylor Gammons
3/4/2008
TA: Zheng Ren
Section 434, 4:005:30PM
Pledge: I pledge that no unauthorized assistance has been given or received in the
completion of the work presented in this report.
________________________
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View Full Document Abstract:
In this experiment, the kinematics and dynamics of uniform circular motion were
observed. This was done by measuring the period of an object undergoing uniform
circular motion with a fixed radius, and different values of net force (different static
masses). A variablespeed rotating platform was used in order to rotate the mass and a
photogate, in conjunction with a smarttimer, was utilized in order to measure the period
of rotation for each static mass added to the apparatus. Using the average period time for
each static mass, the angular speed was calculated for each using the equation 2π / T.
Using the 5 different average times for each static mass, a plot of angular speed squared
vs. force was constructed and used in order to find the mass of the rotating mass. By
taking the slope of the linear regression of this plot, and solving the equation, w
2
= F /
(mr), for m, the mass, the value of the mass of the rotating mass was experimentally
calculated at 0.2036kg. This value was in agreement with the actual mass of the rotating
mass which was measured at 0.2079kg, leaving a 2.07% error.
Data Analysis:
Trial
Period (s)
1
1.5519
2
1.5508
3
1.5489
4
1.5443
5
1.5392
6
1.5294
7
1.5279
8
1.5403
9
1.5509
10
1.5570
Average
1.5441
Average Stopwatch Time
1.59
Standard Deviation
9.766x10
3
Standard Error
3.255x10
3
Table 1:
Data obtained using a static mass of 55.0g
Trial
Period (s)
1
2.6011
2
2.6291
3
2.6450
4
2.6645
5
2.7212
6
2.7433
7
2.7261
8
2.7022
9
2.6705
10
2.6630
Average
2.6766
Average Stopwatch Time
2.65
Standard Deviation
4.579x10
2
Standard Error
1.526x10
3
Table 2:
Data obtained using a static mass of 25.0g
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This note was uploaded on 03/27/2008 for the course PHYS 104 taught by Professor Pengyi during the Spring '08 term at UNC.
 Spring '08
 Pengyi
 Physics, Circular Motion, Work

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