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Does mass affect the period of a pendulum? Procedure: Part Ia 1) Put the meter stick between two tables(about 1 foot apart). Tape the ends of the meter stick in place. Measure enough string to just about reach the floor. 2) Tie the smaller of the two masses to the string and tie the string to the meter stick. Measure the distance from the center of the mass to the meter stick for future reference. This is the length of the pendulum(L). 3) Use your stopwatch to time 5 back and forth swings(periods) of the pendulum. It is important that the angle you pull the pendulum back is no more than 20- 30 degrees from vertical. Record your time for 5 periods. 4) Find the length of 1 period by division. Record your time for one period. 5) Repeat 3 times and take the average of the three periods. Record your average period. Part Ib 6) Attach the larger of the two masses to the string and tie the string to the meter stick. Make sure the distance from the center of the mass to the meter stick(L) is the same as with the smaller mass. 7) Use your stopwatch to time 5 back and forth swings(periods) of the pendulum. It is important that the angle you pull the pendulum back is no more than 20- 30 degrees from vertical. Record your time for 5 periods. 8) Find the length of 1 period by division. Record your period. 9) Repeat 3 times and take the average of the three periods. 10) Compare the two periods from parts Ia and Ib. Does the mass of a pendulum affect the period? Part II. Does the length of the period affect the period of a pendulum? Procedure: Part IIa 1) Put the meter stick between two tables and measure the string so that it just reaches the floor. 2) Attach one of the two masses to the string and tie the string to the meter stick. Record the mass and length of the pendulum(L). 3) Use your stopwatch to time 5 back and forth swings(periods) of the pendulum. It is important that the angle you pull the pendulum back is no more than 20- 30 degrees from vertical. Record your data for 5 periods. 4) Find the length of 1 period by division. Record your period(T). 5) Repeat 3 times and take the average of the three periods. Record your average period. Part IIb 6) Now using the same mass, shorten the string significantly. Make it 1/2 to 2/3 of its original length. Record the mass and length of the pendulum(L). 7) Use your stopwatch to time 5 back and forth swings(periods) of the pendulum. It is important that the angle you pull the pendulum back is no more than 20- 30 degrees from vertical. Record your data for 5 periods. 8) Find the length of 1 period by division. Record your period. 9) Repeat 3 times and take the average of the three periods. Record your average period. 10) Compare the two periods. Does the length of a pendulum affect the period? Part III(optional) Calculating g 1) You can use the results from any of your previous trials 2) The relationship between the period T and the length of the pendulum L can be used to find the acceleration of gravity. 39.44 x L The formula to use is: g = --------------------- (T)2 m The accepted value for g is 9.8 -------- s2 Record your value for g. Record your absolute error(difference between what you calculated and the accepted value). Record your relative error. Relative error(RE) can be found by dividing your absolute error(AE) by your accepted value and expressing it as a percent. AE RE = ---------- x 100 9.8 ace цъФШrLN)+{w{s{w{w{w{w{w{w{w{w{w +koЋАuwyмрeiC G Š Ž ч ї “ • n r В {w{w{w{w{w{w{w{w{w{w{w{В Ж   h z ~ ‹ O Б В Ж   ln{w{w{w{wsls{e{w{wXX LNZcцшФЦrtqqkk рР!t}JL')kmЋ­_amwмоegC E Š Š Œ ч щ ы ѕ ‘ “ n p В Д   a c f h | ~   Ь M O O e Ÿ Д Ж Ф ю  &‚ 6Tln+В n !tŠ O n"#$%MOœшnй§’# €Times New Roman Tw Cen MT Condensed Extra Boldа8  Ўр=а/аЎ Ўр=а/аЎd