I did a lab earlier this week on Newton's second law with a pulley and carts. M2 was the block that traveled horizontally and M1 was the hanging mass. The mass of the cart that was moving horizontally was constant all experiment with about 0.2 kg. The mass of the hanging gradually increased. From this data, we found time, velocity, and acceleration using kinematic equations. We also plotted a graph of Acceleration vs Mass of the hanging block. Here I included a picture of what this experiment looked like: http://i54.tinypic.com/20kw1w.gif 1. The problem statement, all variables and given/known data Draw a diagram showing the forces acting on each block and use Newton's 2nd law to derive the equation for acceleration of the blocks and the tension in the string. Compare the acceleration of the equation above and the general equation for a straight line to prove that the graph you made should be a straight line. Use this to show what the slope and y -int. of the graph should be in terms of 'g' and 'M_total.' M_total is the mass of the whole system (we assume the thread that traveled throughout the pulley was negligble and this system used a frictionless surface). 2. Relevant equations For deriving acceleration and tension, I used the equations T = m2a and -T + m1g = m1a. Then, m1g = m1a + m2a and then I solved for 'a'. I believe these equations are correct but I am not sure how I am supposed to prove this is a straight line and what the slope and y int of the graph should be in terms of g and M_total. The equation I got from my data using the line of best fit is Y = 21.4x + 0.0139 and my mass (kg) was on the x and the acceleration (m/s^2) on the y. 3. The attempt at a solution The above ^^.