Purpose: In this experiment, the position of a bulldozer moving in a straight line is measured at various times, to determine the bulldozer's speed. Procedure: 1. Allow a toy bulldozer ton travel across a table top or the floor for a distance of 3 or 4 meter in a test run. 2. Place a tape measure or a series of meter sticks along the path of travel. Start the bulldozer a few centimeters before the starting line. When the bulldozer reaches the starting line, start keeping track of the time with a stop watch or sweep second hand. 3. Five seconds after the bulldozer crosses the starting line, record its position. Without stopping the bulldozer, repeat this procedure at 5-second intervals. Enter all of the data in the first column of the data chart. 4. Reduce the speed of the bulldozers by forcing it to drag a load behind as it travels. Following the procedure above, record the position of the bulldozer at the end of each 5 second interval in the second column of the data chart. 5. Add heavier weights behind the bulldozer to reduce its speed further and record position and time in the remaining columns of the data chart. Data Chart: Position of bulldozer in cm. (x) Trials Experiment #2 Trials Experimerit #1 2 3 Time in seconds (t) 1 average 3 average Ocm Ocmlocrm 1ocm o Cm oom 87cm al cm 95cm 91 cm 10 Cm 68 cm 79 Cm/72 Cm 10 160em165 cm176 cm161Cm 135 Cm138 cm147cm140 Cm 15 |2420여 2470m 254 cm 248 Cm l1q1 cml20coml 204co2히 Cm. 20 329cm 325 cm 325 cm 326 cm 251om 253.om/266om 251 Cm 25 404cm/396cm403cm 401 cm 316 o310 Cm323 o0316 Cm 30 3870 3720m38200 380 cm Average speed (Vav) in cm /sec 124나. |181 185 204 Cn/S 225cn224 cn288 227 Conld Data and Analysis: 1. For each trial, calculate the average speed, Vav, by dividing the total change in position by the total time interval that elapsed, t. 2. Use the data for the first trial to plot a graph of position vs time. 3. On the same piece of graph paper, plot a graph of position vs time for each of the other trials you ran. label each graph with the number of the associated trial. 4. The shape of a position vs time graph for motion at constant speed is a straight line. Do your graphs have this shape?

Purpose: In this experiment, the position of a bulldozer moving in a straight line is measured at various times, to determine the bulldozer's speed. Procedure: 1. Allow a toy bulldozer ton travel across a table top or the floor for a distance of 3 or 4 meter in a test run. 2. Place a tape measure or a series of meter sticks along the path of travel. Start the bulldozer a few centimeters before the starting line. When the bulldozer reaches the starting line, start keeping track of the time with a stop watch or sweep second hand. 3. Five seconds after the bulldozer crosses the starting line, record its position. Without stopping the bulldozer, repeat this procedure at 5-second intervals. Enter all of the data in the first column of the data chart. 4. Reduce the speed of the bulldozers by forcing it to drag a load behind as it travels. Following the procedure above, record the position of the bulldozer at the end of each 5 second interval in the second column of the data chart. 5. Add heavier weights behind the bulldozer to reduce its speed further and record position and time in the remaining columns of the data chart. Data Chart: Position of bulldozer in cm. (x) Trials Experiment #2 Trials Experimerit #1 2 3 Time in seconds (t) 1 average 3 average Ocm Ocmlocrm 1ocm o Cm oom 87cm al cm 95cm 91 cm 10 Cm 68 cm 79 Cm/72 Cm 10 160em165 cm176 cm161Cm 135 Cm138 cm147cm140 Cm 15 |2420여 2470m 254 cm 248 Cm l1q1 cml20coml 204co2히 Cm. 20 329cm 325 cm 325 cm 326 cm 251om 253.om/266om 251 Cm 25 404cm/396cm403cm 401 cm 316 o310 Cm323 o0316 Cm 30 3870 3720m38200 380 cm Average speed (Vav) in cm /sec 124나. |181 185 204 Cn/S 225cn224 cn288 227 Conld Data and Analysis: 1. For each trial, calculate the average speed, Vav, by dividing the total change in position by the total time interval that elapsed, t. 2. Use the data for the first trial to plot a graph of position vs time. 3. On the same piece of graph paper, plot a graph of position vs time for each of the other trials you ran. label each graph with the number of the associated trial. 4. The shape of a position vs time graph for motion at constant speed is a straight line. Do your graphs have this shape?