15682 Words63 Pages

Includes
Teacher's Notes and Typical
Experiment Results
Instruction Manual and
Experiment Guide for the PASCO scientific
Model ME-9206A and
ME-9215A
0 12-06379A
3/99
PHOTOGATE TIMERS
© 1988 PASCO scientific
$15.00
012-06379A
Photogate Timers
Table of Contents
Page
Copyright and Warranty .................................................................................. ii
Equipment Return ............................................................................................ ii
Introduction ..................................................................................................... 1
Operation .........................................................................................................*…show more content…*

Tape a piece of cardboard on top of the glider, as shown in Figure 1.2. Raise the photogate so it is the cardboard, not the body of the glider, that interrupts the photogate. Use just one photogate and place it at x1. Set the timer to GATE. Now D is the length of the cardboard. Measure D by passing the glider through the photogate and noting the difference in glider position between where the LED first comes on, and where it goes off again. Then start the glider from x0 as before, and make several measurements of the time it takes for the glider to pass through the photogate. As before, record your times as t1 through t5. Continue decreasing the value of D, by using successively smaller pieces of cardboard. Data and Calculations For each value of D, calculate the average of t1 through t5. Record this value as tavg. Calculate vavg = D/tavg. This is the average velocity of the glider in going between the two photogates. Plot a graph of vavg versus D with D on the x-axis. Table 1.1 Data and Calculations x1*…show more content…*

11 12 13 14 Press the RESET button. Again, start the glider from x0. This time measure and record t3, the time it takes the glider to pass between the photogates. Repeat this measurement four more times and record the average of these measurements as t3 in Table 4.1. Vary ma, by moving masses from the glider to the hanger (thus keeping the total mass, m + ma, constant.) Record m and ma and repeat steps 5 through 11. Try at least four different values for ma. Now leave ma constant at a previously used value. Vary m by adding or removing mass from the glider. Repeat steps 5-11. Try at least four different values for m. Calculations For each set of experimental conditions: Use the length of the glider and your average times to determine v1 and v2, the average glider velocity as it passed through each photogate. Use the equation a = (v2 - v1)/t3 to determine the average acceleration of the glider as it passed between the two photogates. Determine Fa, the force applied to the glider by the hanging mass. (Fa = mag; g = 9.8 m/s2 = 980 cm/s2) Analysis Draw a graph showing average acceleration as a function of applied force,

Tape a piece of cardboard on top of the glider, as shown in Figure 1.2. Raise the photogate so it is the cardboard, not the body of the glider, that interrupts the photogate. Use just one photogate and place it at x1. Set the timer to GATE. Now D is the length of the cardboard. Measure D by passing the glider through the photogate and noting the difference in glider position between where the LED first comes on, and where it goes off again. Then start the glider from x0 as before, and make several measurements of the time it takes for the glider to pass through the photogate. As before, record your times as t1 through t5. Continue decreasing the value of D, by using successively smaller pieces of cardboard. Data and Calculations For each value of D, calculate the average of t1 through t5. Record this value as tavg. Calculate vavg = D/tavg. This is the average velocity of the glider in going between the two photogates. Plot a graph of vavg versus D with D on the x-axis. Table 1.1 Data and Calculations x1

11 12 13 14 Press the RESET button. Again, start the glider from x0. This time measure and record t3, the time it takes the glider to pass between the photogates. Repeat this measurement four more times and record the average of these measurements as t3 in Table 4.1. Vary ma, by moving masses from the glider to the hanger (thus keeping the total mass, m + ma, constant.) Record m and ma and repeat steps 5 through 11. Try at least four different values for ma. Now leave ma constant at a previously used value. Vary m by adding or removing mass from the glider. Repeat steps 5-11. Try at least four different values for m. Calculations For each set of experimental conditions: Use the length of the glider and your average times to determine v1 and v2, the average glider velocity as it passed through each photogate. Use the equation a = (v2 - v1)/t3 to determine the average acceleration of the glider as it passed between the two photogates. Determine Fa, the force applied to the glider by the hanging mass. (Fa = mag; g = 9.8 m/s2 = 980 cm/s2) Analysis Draw a graph showing average acceleration as a function of applied force,

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