Theory Newton's Second Law, Fnet = ma, is a description of the relationship between Fnet, the ne acting on an object or system of mass m, and a, the resulting acceleration of the object or sy: We will be testing this in two systems: a cart on a horizonal track pulled by a hanging mass a Atwood machine, with two masses on either side of a pulley. or a cart of mass m2 on a horizontal track with a string attached over a pulley to a mass m 1 et force Fnet on the entire system is the weight of the hanging mass m g, assuming friction egligible. For the Atwood machine the net force Fnet is (m-m2) g (assuming m > m). ccording to Newton's Second Law, this net force should be equal to ma where m is the tota celerated, which in both cases is m + m. heory ocedure (Hanging Mass) m Photogate Super Pulley Photogate Bracket to Smart Timer Adjustable End Stop Mass Hanger and Mass Dynamics Cart m. Uniform Acceleration Lab - 1 IDS Track Figure 2.1 Experiment setup to determine the acceleration of the mas