Using a Pendulum to Find Gravity
Aim:
To find the gravity by finding the period of the oscillations of a
pendulum and plotting a graph.
Hypothesis and Prediction:
- the gravity from the graph is going to equal the gravity from the
formula.
Variables:
The independent variable is the length of the string
The Dependent variable is the period of one oscillation
Controlled variables are: - mass of the pendulum
Equipment:
-Brass Ball
-string
-boss and clamp
-stopwatch
-2 metal blocks
-Meter Ruler
-Micrometer
[IMAGE]
-The diameter of the brass ball was measured using a micrometer. Then
the value was divided by 2 to give the radius
-the length of the string was measured
-two metal block were clamped with the string in between, the string
was tied to the bob
-the bob was pulled to the side and released
-the time was started when the bob passed the reference line.
-a full oscillation is when the bob passes the reference line forth
back and forth again.
- the length of the string is increased or decreased in a regular
pattern
- the time was monitored by reading through the stopwatch.
-the same brass ball was used over the experiment to keep the mass
constant.
- the length was varied 10 times with a 10 cm difference.
-4 readings were taken for each 10 cm
-the time was taken for 20 oscillations. And then divided by 20 to
give one oscillation.
Data Collection:
Table number
Length of String / M
± 0.05
Number of oscillations
Time Taken/s
± 0.5
Period/s
± 0.5
1
1.01
20
39.65
1.9825
20
41.93
2.0965
20
39.82
1.991
20
39.94
1.997
2
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