6.Click Examine, , and move the mouse across the force vs.time graph. When the force is maximum, is the acceleration maximum or minimum? To turn off Examine mode, click Examine, , again. 7.The graph of force vs.acceleration should appear to be a straight line. To fit a straight line to the data, click the graph, then click Linear Fit, . Record the equation for the regression line in the data table.8.Print copies of each graph.Trial II 9.Remove the Accelerometer, attach the 0.50 kgmass to the cart, and then re-attach theAccelerometer (see Figure 4). Record the totalmass of the cart, sensors, and additional mass inthe data table.10.Repeat Steps 4–8. DATA TABLETrial 1 Mass of cart with sensors (kg)Regression line for force vs. acceleration dataTrial IIMass of cart with sensors and additional mass (kg)Regression line for force vs. acceleration dataANALYSIS1.Are the net force on an object and the acceleration of the object directly proportional? Explain, using experimental data to support your answer.2.What are the units of the slope of the force vs.acceleration graph? Simplify the units of the slope to fundamental units (m, kg, s). 3.For each trial, compare the slope of the regression line to the mass being accelerated. What does the slope represent?4.Write a general equation that relates all three variables: force, mass, and acceleration.Figure 4
9 - 4 Physics with Vernier Computer 9 EXTENSION Use this apparatus as a way to measure mass. Place an unknown mass on the cart. Measure the acceleration for a known force and determine the mass of the unknown. Compare your answer with the actual mass of the cart, as measured using a balance.
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