PASCO ME-9215B Photogate Timer - Manual (Page 39)

012-06379B Photogate Timer
35 ®
Table 7.2 Both Gliders have Initial Velociies
L
1
= 12.6 cm L
2
= 12.8 cm Distance Between Photogates = 60cm
Table 8.1
d = 100 cm h = 1.3 cm
D = 80 cm L= 12.6 cm
θ= 0.013 rad
m t
1
t
2
v
1
v
2
E
k1
E
k2
E
k2
-E
k1
ΔΔΔΔΔ(mgh) % Error
(g) (s) (s) (m/s) (m/s) (J) (J) (J) (J) (%)
180.2 0.35 0.22 0.36 0.57 0.01 0.03 0.02 0.02 5.82
200.2 0.35 0.22 0.36 0.57 0.01 0.03 0.02 0.02 6.31
220.2 0.35 0.22 0.36 0.57 0.01 0.04 0.02 0.02 5.75
240.3 0.35 0.22 0.36 0.57 0.02 0.04 0.02 0.02 5.39
301.8 0.35 0.22 0.36 0.57 0.02 0.05 0.03 0.03 5.53
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) (%)
180.2 261.3 0.362 0.422 0.312 0.589 0.35 -0.30332 -0.40 0.22 0.02 0.02 9.03
180.2 261.3 0.353 0.427 0.313 0.568 0.36 -0.29977 -0.40 0.23 0.02 0.02 8.54
180.2 261.3 0.49 0.468 0.356 0.848 0.26 -0.27350 -0.35 0.15 0.02 0.01 9.33
180.2 261.3 0.461 0.574 0.42 0.726 0.27 -0.22300 -0.30 0.18 0.01 0.01 7.99
180.2 261.3 0.486 0.593 0.435 0.778 0.26 -0.21585 -0.29 0.16 0.01 0.01 8.63
L
1
= 12.8 cm L
2
= 12.6 cm Distance Between Photogates = 60cm
Exp 8 - Conservation of Mechanical Energy
Notes - on Analysis
The tables below list the typical results for the experiment performed at two different incline angles.
Notes - on Questions
c
Yes.
d
In most cases, there was a slight loss of kinetic
energy due to existence of slightly inelastic colli-
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) (%)
261.3 180.2 0.349 0.285 0.475 0.265 0.37 -0.44211 -0.27 0.48 0.04 0.03 15.14
261.3 180.2 0.442 0.354 0.583 0.332 0.29 -0.35593 -0.22 0.38 0.02 0.02 13.84
261.3 180.2 0.491 0.451 0.769 0.372 0.26 -0.27938 -0.17 0.34 0.02 0.01 12.29
261.3 180.2 0.4 0.327 0.542 0.302 0.32 -0.38532 -0.24 0.42 0.03 0.02 14.15
261.3 180.2 0.346 0.298 0.503 0.264 0.37 -0.42282 -0.25 0.48 0.03 0.03 14.72
sions. Secondly, as the gliders collided, the linear motion
of the gliders might be changed to include vibvrations thus
converting simple kinetic energy to include vibrational
energy not accounted for. Some of the kinetic energy was
converted into heat due to friction.