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34
Photogate Timer
012-06379B
®
Notes - on Procedure
i
In order to ensure that the gliders are as close to
travelling at constant velocities as possible prior to
collision, the distance between the photogates should be
reduced. Also, the gliders should be pushed to collide
with the ends of air track so that the rebounded gliders
will have near constant velocities prior to triggering the
photogates.
The tables below list the results from two experiemtnal
conditions. Table 7.1 presents the results of elastic colli-
sion with one glider being initially stationary. Table 7.2
presents the results of elastic collision with both gliders
moving intially.
Exp 7 - Conservation of Kinetic Energy
Table 7.1 Glider 2 is Initially Stationary
L
1
= 12.6 cm
L
2
= 12.8 cm
Distance Between Photogates = 79.8cm
m
1
m
2
t
1i
t
2i
t
1f
t
2f
v
1i
v
2i
v
1f
v
2f
E
ki
E
kf
% Error
(g)
(g)
(s)
(s)
(s)
(s)
(m/s) (m/s) (m/s)
(m/s)
(J)
(J)
(%)
180.2
201.3
0.275
N/A
3.81
0.318
0.46
0
-0.03
0.40
0.02
0.02 13.26
180.2
201.3
0.33
N/A
4.267
0.381
0.38
0
-0.03
0.34
0.01
0.01 12.92
180.2
201.3
0.242
N/A
3.369
0.278
0.52
0
-0.04
0.46
0.02
0.02 12.12
180.2
201.3
0.295
N/A
3.43
0.341
0.43
0
-0.04
0.38
0.02
0.01 12.98
180.2
201.3
0.239
N/A
3.635
0.274
0.53
0
-0.03
0.47
0.03
0.02 11.85
180.2
261.5
0.492
N/A
3.956
0.637
0.26
0
-0.03
0.20
0.01
0.01 9.11
180.2
261.5
0.38
N/A
2.597
0.481
0.33
0
-0.05
0.27
0.01
0.01 4.39
180.2
261.5
0.243
N/A
1.513
0.309
0.52
0
-0.08
0.41
0.02
0.02 4.80
180.2
261.5
0.202
N/A
1.164
0.256
0.62
0
-0.11
0.50
0.04
0.03 3.74
180.2
261.5
0.274
N/A
1.625
0.35
0.46
0
-0.08
0.37
0.02
0.02 5.37
180.2
302.2
0.4
N/A
1.747
0.562
0.31
0
-0.07
0.23
0.01
0.01 7.08
180.2
302.2
0.31
N/A
1.317
0.436
0.41
0
-0.10
0.29
0.01
0.01 6.97
180.2
302.2
0.262
N/A
1.119
0.366
0.48
0
-0.11
0.35
0.02
0.02 5.83
180.2
302.2
0.377
N/A
1.408
0.474
0.33
0
-0.09
0.27
0.01
0.01 -16.65
180.2
302.2
0.246
N/A
1.053
0.342
0.51
0
-0.12
0.37
0.02
0.02 5.00
180.2
402.5
0.3
N/A
0.834
0.51
0.42
0
-0.15
0.25
0.02
0.01 7.30
180.2
402.5
0.15
N/A
0.421
0.259
0.84
0
-0.30
0.49
0.06
0.06 9.99
180.2
402.5
0.219
N/A
0.602
0.368
0.58
0
-0.21
0.35
0.03
0.03 5.13
180.2
402.5
0.214
N/A
0.596
0.363
0.59
0
-0.21
0.35
0.03
0.03 6.99
180.2
402.5
0.171
N/A
0.473
0.287
0.74
0
-0.27
0.45
0.05
0.05 5.10