In this experiment you will calculate the acceleration of an object as it falls toward the earth's surface. Air resistance is not considered for an object in free fall, and such an object moves toward the surface with a uniform accelerated motion due to gravity (g). The value of g varies with location on surface of the earth, increasing with latitude to a maximum at the poles. The value of g also varies with elevation, decreasing with elevation at a certain latitude. The average, or standard, value of g, however, is usually accepted as 9.8 m/s2 or 980 cm/s2. When you measure the total distance that an object moves during some period, you can calculate an average velocity. Average velocity is defined as