# Pendulum.

Essay by weapon_xCollege, UndergraduateA+, May 2003

Pendulum

Aim: (1) To determine the value of g, the acceleration due qqqgravity

(2) And to investigate how the period time (t) of an gggoscillating Pendulum, varies with the length of the string.

Apparatus/Material: retort stand,

String,

Bob,

Protractor,

Stop watch.

Procedure: (1) length of pendulum was measured,

(2) An angle of 50ÃÂÃÂ was the size of the angle to which gggpendulum was raised and released,

(3) The time for twenty oscillations was recorded for gggthat length and angles

(4) Steps (1) to (4) were repeated for nine other ggglengths.

Results:

Length of pendulum

In cm Time for 20 oscillations (T1) in secTime for 20 oscillations (T2) in secAverage time in sec Time for 1 period in secAcceleration due to gravity ,g

86393838.51.9259.16

81.53735361.89.92

65.5333232.51.6259.79

57.2313030.51.5259.71

51282928.51.4259.91

452727271.359.73

Length of pendulum

In cm Time for 20 oscillations (T1) in secTime for 20 oscillations (T2) in secAverage time in sec Time for 1 period in secAcceleration due to gravity ,g

36.5242524.51.2259.6

23.5192019.5.9759.76

19181818.99.26

14.5161616.88.94

Average acceleration due to gravity = 9.577

Precautions; (1) The angle which the pendulum was allowed to aaaswing from was carefully maintain for each trial.

(2) The person with the fast reflexes was put in aaacontrol of the stop watch.

Source of errors (1) angle to wish pendulum was raised couldn't be >>identically repeat, regardless of how carefully we were.

(2) And person controlling stop watch couldn't >>stop the identical moment when 20 oscillations were made that >>is impossible.

Calculations; T" = 4ÃÂ"l\g

1.225" = 39.48 X .365/g

1.500625g = 14.4102

g = 14.4102/1.5006265

g=9.60

conclusion; the acceleration due to gravity is 9.577 and the period time T of am oscillating pendulum gets faster when the length of the string is shorten, in other words the frequency of the pendulum is increased when the string is...