The static and dynamic properties of an asymmetric rigid body are studied using a Lagrangian approach. The body consists of a thin-walled cylinder balanced by a point mass attached to its inner surface. When resting on an inclined plane, stable and unstable equilibrium points are found, and oscillations about the stable point are studied for different angles of inclination and different values of the balancing mass. The analysis illustrates the utility of Lagrangian mechanics, and the derived results can be experimentally verified using simple materials.
REFERENCES
1.
A.
Goyal
, “
Block inside a cylinder kept on inclined plane
,” <https://www.youtube.com/watch?v=x1TThT3HGpQ>.2.
R.
De Luca
, “
Will the wheel stand still uphill?
,” Phys. Teach.
(to be published).3.
W. F. D.
Theron
, “
The rolling motion of an eccentrically loaded hoop
,” Am. J. Phys.
68
(9
), 812
–820
(2000
).4.
W. F. D.
Theron
and
N. M.
du Plessis
, “
The dynamics of a massless hoop
,” Am. J. Phys.
54
(3
), 354
–359
(2001
).5.
A.
Carnevali
and
R.
May
, “
Rolling motion of non-axisymmetric cylinders
,” Am. J. Phys.
73
(10
), 909
–913
(2005
).6.
A.
Taylor
and
M.
Fehrs
, “
The dynamics of an eccentrically loaded hoop
,” Am. J. Phys.
78
(5
), 496
–498
(2010
).7.
L.
Turner
and
A. M.
Turner
, “
Asymmetric rolling bodies and the phantom torque
,” Am. J. Phys.
78
, 905
–907
(2010
).8.
J. H.
Jensen
, “
Rules for rolling as a rotation about the instantaneous point of contact
,” Eur. J. Phys.
32
, 389
–397
(2011
).9.
B.
Yu-Kuang Hu
, “
Rolling of asymmetric discs on an inclined plane
,” Eur. J. Phys.
32
, L51
–L54
(2011
).10.
© 2021 Author(s). Published under an exclusive license by American Association of Physics Teachers.
2021
Author(s)
AAPT members receive access to the American Journal of Physics and The Physics Teacher as a member benefit. To learn more about this member benefit and becoming an AAPT member, visit the Joining AAPT page.