# 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 [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