Page #7 Page # 8 Taking Data Table 1. Calculating Average Velocities 1. Start recording data, then drop the Picket Fence through the Photogate. Stop recording data. Block Times (5) (s) Average Time 2. If the Picket Fence hits the Photogate, or if it rotates too much, you (s) should take another run. You should have seven entries in the data 0.39700 0.04320 0.41850 1.157407407 table. These are the times that each of the seven bands on the 0,44020 Picket Fence broke the Photogate beam. 0.03272 0.45656 1 528117359 3 0.47292 0.02745 0.48664 1.821493625 Calculations 4 0.50037 0.02413 0.51243 2.072109407 5 0.52450 0.02174 0.53537 2.299908004 3. Calculate the difference (At) between block times and enter them 0.54624 0.01993 0.55621 2.508780733 into the column in the table. Note that you may have to increase the number of decimal places in each column to see the difference 0.56617 between the numbers. You can do this using the tool at the top of B the graph. 4.Calculate the average speed of the Picket Fence during the time between the first and second block. 2.6 V =. AX _ AX 2.4 At t2 - t 2.2 I where t is the time each block occured. Axis the spacing between 2.0 the bands on the Picket Fence, and is measured from the beginning V= AXA (m/'s) of one band to the beginning of the next. You can measure over 1.8 several bands to get a more accurate value of Ax. Enter your 1.6 calculated average speeds into the table. You will end up with only six 1.4 velocities in your table. 1.2 1.1 6. To calculate the time that the average velocity actually occurred, 0.9 1.0 0.7 0.5 0.6 calculate the average time between the Block Times. Add adjacent Average Time (s) Block Times and divide by 2. Enter these times into the table under Average Time. Avg Velocity vs. Time