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Anil Kanungo
ME324 – Fri 2pm
10/31/08
Working Model Assignment #2
Using the 2D modeling software known as Working Model, we were able to design a springpowered,
torsional pendulum and observe its dynamic motion under certain conditions. The assignment allowed us to study
the nature of impulsemomentum, conservation of energy, and Newton’s Laws. It gives us the dimensions for a
torsional pendulum with a length of .3 m, connecting bob (m
B
) with mass of 1 kg, and connecting torsional spring
with restoring force of 0.1 N/rad. The bob is acted on by another mass (m
A
) of 10 kg which has a horizontal,
impulsive force of 500 N acting on it. These initial conditions are illustrated below:
For Part A, we proceeded to find the duration of the impulsive force
F
needed to raise bob B a third of the
height of the pendulum. The maximum height obtained was calculated using the simple equation of
h=L/3
, while
the impulse time required a series of equations including
U=½kθ
2
for total energy,
T
1
+V
1
=T
2
+V
2
for conservation of
energy,
m
A
v
1
+m
B
v
1
=m
A
v
2
+m
B
v
2
for conservation of momentum,
e[v
A1
v
B1
]=[v
B2
v
A2
]
for evaluating collisions as
elastic, and
∫F
dt
=mvmv
0
to evaluate time. By finding the value of v
A1
=.2251 m/s
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 Fall '08
 Neptune
 Torsion

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