1. GRAVITATIONAL ACCELERATION Measurement and results from Austria

2. GRAVITATIONAL ACCELERATION Gravity of Earth g depends on  the geometrical shape of the Earth  the distribution of masses  the geographical latitude  the altitude relative to sea level  the air resistance (which usually is ignored)

3. GRAVITATIONAL ACCELERATION Values for Graz: the geographical latitude: latitude: 47,070714° the altitude relative to sea level: 353 m Value of g: g = 9.8070 m/s² http://www.oebv.at/sixcms/media.php/229/13_Newtons_Gravitationsgeset z_Kompetenzen.pdf

4. EXPERIMENTAL SETUP

5. THE RESULTS These are the best results we figured out, it`s pretty close to the real number of 9,8070 m/s². Number of measurement:12345678910 length of the pendulum l [m]1,33 1,415 1,341,03 Number of oszillations N5010020010040100 20 t time for N oszillations [s]115,7231,39462,79238,5595,53238,69238,6238,8446,42540,74 Time of 1 period T [s]; T = t/N2,3142,31392,3142,38552,38832,38692,3862,38842,32132,037 acceleration due to gravity g = 4 π^2 l / T^2 [m/s^2]9,80589,80679,80639,81659,79399,80509,81249,79279,81799,7997