Record the mass in the data table. 4. Place the cart on a level surface. Make sure the cart is not moving and click . Check to make sure both sensors are highlighted and click . Trial I 5. You are now ready to collect force and acceleration data. Grasp the Force Sensor hook. Click and take several seconds to move the cart back and forth on the table. Vary the motion so that both small and large forces are applied. Make sure that your hand is only touching the hook on the Force Sensor and not the Force Sensor or cart body.

6. Note the shape of the force vs. time and acceleration vs. time graphs. Click the Examine button, , 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 on the Examine button, . 7. The graph of force vs. acceleration should appear to be a straight line. To fit a straight line to the data, click on the graph, then click the Linear Fit button, . Record the equation for the regression line in the data table. 8. Print copies of each graph. Trial 2 9. Attach the 0.500 kg mass to the cart. Record the mass of the cart, sensors, and additional mass in the data table. 10. Repeat Steps 5–8.

DATA TABLE Trial I Trial 2 Figure 1Trial 1 Figure 2Trial 2

ANALYSIS 1. Compare the graphs of force vs. time and acceleration vs. time for a particular trial. How are they different? How are they the same? 2. Are the net force on an object and the acceleration of the object directly proportional?