An Experiment to measure acceleration due to gravity

Draw a diagram of this experiment

Step 1

Set up apparatus as shown with the length of the string set at 1m (measured from the bottom of the cork to the middle of the weight

Step 2

Set the pendulum swinging non-elliptically through an arc of <5 degrees. Measure the time taken for 25 oscillations

Step 3

Hence calculate the periodic time which is the time for 1 oscillation

Step 4

Reduce length of pendulum by 10cm and repeat steps 1-3

Step 5

Repeat step 4 four more times

Step 6

Plot a graph of l Vs. T² and find it's slope

Step 7

Multiply the slope by 4π² to find the acceleration due to gravity

What is on the y axis of this graph?

l (length)

What is on the x axis of this graph?

T² (periodic time squared)