User's Manual
012–06408A RMS/IDS Kit
29
Table 4.1
½m
1
v
1
2
+½m
2
v
2
2
½m
1
after
v
1
after
2
+
½m
2
after
v
1
after
2
(N s) (N s)
Table 4.2
measured
calculated
measured
calculated
calculated
measured
calculated
measured
m
1
v
1
m
2
v
2
m
1
after
v
1
after
m
2
after
v
2
after
m
1
v
1
+ m
2
v
2
m
1
after
v
1
after+
m
2
after
v
2
after
(kg) (m/s) (kg) (m/s) (kg) (m/s) (kg) (m/s) (kg m/s) (kg m/s)
0.51 0.31 0.46 0 0.51 0 0.46 0.32 0.16
0.16
0.15
0.15
0.025
0.026
0.024
0.023
Questions:
1. Both total momentum and total kinetic energy are conserved after the collision, but the
total KE temporarily drops (having been converted to potential energy during the first half
of the elastic collision) and then rises (as potential energy is converted to kinetic energy in
the second half of the elastic collision.
2. Friction gradually reduced both the total momentum and total KE until both reach zero.
Friction reduced the momentum and KE more rapidly in the system with more mass (Part
B).
3. Other variables include vibration in the system and mechanical effects.