PASCO ME-9215B Photogate Timer - Manual (Page 36)

32
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 experimental
conditions. Table 6.1 presents the results of elastic colli-
sion with one glider being initially stationary. Table 6.2
presents the results of elastic collision with both gliders
moving intially.
Notes - on Questions
c
Yes. This assumption can be tested by setting the
photogates at a fixed distance apart but moving them
along the air track to measure and compare the aver-
age accelerations along the line of motion.
d
This equation is valid if and only if the acceleration is
truly constant. Yes.
e
No. The gravitional force by the earth on the moon
and vice versa is described by
F = ,
where:
G = universal gravitational constant
m
1
= Mass of Earth
m
2
= Mass of Moon
R = Distance between the centers of
gravity of the two bodies
Exp 6 - Conservation of Momentum
Table 6.1 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
P
i
P
f
% Error
(g) (g) (s) (s) (s) (s) (m/s) (m/s) (m/s) (m/s) (kg*m/s) (kg*m/s) (%)
180.2 201.3 0.275 N/A 3.81 0.318 0.46 0 -0.03 0.40 0.08 0.08 9.08
180.2 201.3 0.33 N/A 4.267 0.381 0.38 0 -0.03 0.34 0.07 0.06 9.44
180.2 201.3 0.242 N/A 3.369 0.278 0.52 0 -0.04 0.46 0.09 0.09 8.40
180.2 201.3 0.295 N/A 3.43 0.341 0.43 0 -0.04 0.38 0.08 0.07 10.43
180.2 201.3 0.239 N/A 3.635 0.274 0.53 0 -0.03 0.47 0.10 0.09 7.59
180.2 261.5 0.492 N/A 3.956 0.637 0.26 0 -0.03 0.20 0.05 0.05 -1.43
180.2 261.5 0.38 N/A 2.597 0.481 0.33 0 -0.05 0.27 0.06 0.06 -1.83
180.2 261.5 0.243 N/A 1.513 0.309 0.52 0 -0.08 0.41 0.09 0.09 0.13
180.2 261.5 0.202 N/A 1.164 0.256 0.62 0 -0.11 0.50 0.11 0.11 1.03
180.2 261.5 0.274 N/A 1.625 0.35 0.46 0 -0.08 0.37 0.08 0.08 1.45
180.2 302.2 0.4 N/A 1.747 0.562 0.31 0 -0.07 0.23 0.06 0.06 1.64
180.2 302.2 0.31 N/A 1.317 0.436 0.41 0 -0.10 0.29 0.07 0.07 2.41
180.2 302.2 0.262 N/A 1.119 0.366 0.48 0 -0.11 0.35 0.09 0.09 1.46
180.2 302.2 0.246 N/A 1.053 0.342 0.51 0 -0.12 0.37 0.09 0.09 0.82
180.2 402.5 0.3 N/A 0.834 0.51 0.42 0 -0.15 0.25 0.08 0.07 2.50
180.2 402.5 0.15 N/A 0.421 0.259 0.84 0 -0.30 0.49 0.15 0.14 4.22
180.2 402.5 0.219 N/A 0.602 0.368 0.58 0 -0.21 0.35 0.10 0.10 1.34
180.2 402.5 0.214 N/A 0.596 0.363 0.59 0 -0.21 0.35 0.11 0.10 2.14
180.2 402.5 0.171 N/A 0.473 0.287 0.74 0 -0.27 0.45 0.13 0.13 0.96