A previously unpublished example is presented to illustrate the advantages of using the instantaneous center as a point around which moments can be calculated.

1.
F. R.
Zypman
, “
Moments to remember—The condition for equating torque and rate of change of angular momentum
,”
Am. J. Phys.
58
(
1
),
41
43
(
1990
).
2.
M. S.
Tiersten
, “
Moments not to forget—The conditions for equating torque and rate of change of angular momentum around the instantaneous center
,”
Am. J. Phys.
59
(
8
),
733
738
(
1991
).
3.
S. L.
Loney
,
Dynamics of a Particle and of Rigid Bodies
(
Cambridge U. P.
,
London
,
1946
), p.
257
(first published in 1909).
4.
C. G.
Lambe
,
Applied Mathematics for Engineers and Scientists
(
The English Universities Press
,
London
,
1958
), p.
155
.
5.
J. L.
Meriam
and
L. G.
Kraige
,
Engineering Mechanics: Dynamics
, 4th ed. (
J Wiley
,
New York
,
1998
).
6.
W. F. D.
Theron
and
N. M.
du Plessis
, “
The dynamics of a massless hoop
,”
Am. J. Phys.
69
(
3
),
354
359
(
2001
).
7.
E. A.
Desloge
,
Classical Mechanics
(
J. Wiley
,
New York
,
1982
), p.
230
. As quoted by Zypman and by Tiersten in Refs. 1 and 2.
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