Using a Pendulum to Find Gravity

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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

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-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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