Wave pendulum lab

For an interactive simulation, click here  =>  (http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1029.0) 
 
Goal: Use the equationT= 2π√(L/g). Measure the period of each individual pendulum on my "wave Pendulum." After finding the periods, I will find the length of the string using the equation above. Later, I will compare the calculated length to the actual length. 

Procedure: Using a Photogate timer, find the period of each pendulum. Afterwards, by using the equation mentioned above, find the length of each string. Finally, find the actual length by using a meter stick and compare the lengths. 

Equipment: Eight pendulums of different lengths to form a "wave pendulum." 
                        Photogate timer
                        meter stick
                        Calculator

Data:
Periods of each pendulum.
1.    .937s        (Shortest)
2.    1.001s
3.    1.064s
4.    1.126s
5.    1.201s
6.    1.246s
7.    1.299s
8.    1.345s        (longest)

Length of each pendulum using the equation: Equation used: l=(T/2π)^2(g)
1.    .218m
2.    .249m
3.    .281m
4.    .315m
5.    .358m
6.    .386m
7.    .375m
8.    .449m

Measured length of pendulums:
1.    .202m
2.    .238m
3.    .270m
4.    .302m
5.    .351m
6.    .375m
7.    .407m
8.    .440m

Percent error:
1.    7.62%
2.    4.52%
3.    1.1%
4.    4.21%
5.    1.97%
6.    2.89%
7.    8.82%
8.    2.02%



And here's a SWEET pendulum.