pendulum bob.ppt
Post on 01-Jan-2016
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TRANSCRIPT
To investigate the relationship between length of a simple
pendulum and period of the of oscillation
Inference:
The period of pendulum is affected by the length of the thread.
Hypothesis:
The longer the length of a simple pendulum, the longer will be the period of oscillation
Aim:
To investigate the relationship between length of a simple
pendulum and the square of its period of oscillation
Variable:
Manipulated variable: The length,l
Responding variable : Period, T
Constant variable:Mass of pendulum bob, m
Apparatus and material
• Retort stand, pendulum bob, sting(thread), metre rule, stop watch.
Diagram
Procedure:
1.The apparatus was set up as shown in figure.
2.The length of thread,l was measured by a metre rule, starting with 20.0 cm. The bob of the pendulum was displaced and released.
3.The time for 20 complete oscillation, t was taken using stopwatch. Calculate the period of oscillation by using
20
tT
5.The experiment was repeated using different of lengths, l =40.0 cm, 60.0 cm, 80.0 cm and 90.0 cm.
Observation / Tabulated data
20
tT
Length of string, l (cm)
Time taken for 20 oscillation, t (s)
Period of oscillation
/(s)
T2 / (s2)
t1 t2 taverage
20.0 12.80 12.76
40.0 14.44 14.27
60.0 16.01 15.52
80.0 18.40 17.88
90.0 19.34 19.41
Observation / Tabulated data
20
tT
Length of string, l (cm)
Time taken for 20 oscillation, t (s)
Period of oscillation
/(s)
T2 / (s2)
t1 t2 taverage
20.0 10.34 10.22
30.0 11.39 11.40
40.0 12.49 12.60
50.0 15.44 15.30
60.0 16.61 16.44
Observation / Tabulated data
20
tT
Length of string, l (cm)
Time taken for 20 oscillation, t (s)
Period of oscillation
/(s)
T2 / (s2)
t1 t2 taverage
20.0 10.30 9.93
30.0 11.57 11.50
40.0 13.58 13.45
50.0 15.20 15.28
60.0 17.21 17.14
Graph T2 against l
T2 / s2
l/cm
Observation / Tabulated data
20
tT
Length of string, l (cm)
Time taken for 20 oscillation, t (s)
Period of oscillation
/(s)
T2 / (s2)
t1 t2 taverage
20.0
40.0
60.0
80.0
90.0
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