simple pendulum
FIRST TEST 
Maintain fixed the length and changing the amplitude of the oscillation. Record the results in a table. 
The period increases, decreases or remains constant? 
SECOND TEST
Maintain fixed the amplitude of the oscillation and measure the period. Record the result in a table.
Check the hypothesis. 
The period of oscillations is proportional to the square root of the pendulum length.
Use an Excel spreadsheet to analyse the results.
http://www.esperimentifisica.cloud/phisics_laboratory/pendulum/pendulum.html