Still other ideas are contained in Hake (1998): Socratic Dialogue
Inducing (SDI) Lab #3 "Circular Motion And Frictional Forces". SDI
Labs have been recently described in Hake (2002).
Among the uniform circular motion topics of SDI Lab #3 are:
I. Vectors F, v, a, and Angular Velocity For Various Bodies In
Uniform Circular Motion:
A. Bucket of Water (See Hake 1992 - "Water Bucket Swing" - Why
doesn't the water fall out of the bucket when swung over the head in
a vertical circle?)
B. The Moon (Why doesn't the Moon fall down to Earth?)
C. Conical Pendulum
II. FRICTIONAL FORCES IN CIRCULAR MOTION
A. Frictional Force on a Cube Rotating on a Turntable
B. Critical Value of Angular Velocity for Fly-off From the
Table
C. Variables Affecting the Above
D. Limiting Conditions
E. Super Splash Spinner - A Thought Experiment: "At the 'National
Physics-Fun Amusement Park' you and the rest of the class pile on the
'Super Splash Spinner,' a giant motorized version of the turntable
used in this lab. The spinner's angular velocity omega is very
gradually and uniformly increased from zero. One by one your
classmates fly off the spinner and splash into the surrounding pool.
(Would it be wise to wave goodbye to them?) As omega increases you
consider the Newtonian physics of the critical value omega(c) for
your fly-off from the spinner. The coefficient of static friction
between you and the spinner is mu(s). Your mass is m. Ignore air
friction.
F. Experimental Measurement of the Coefficient of Static Friction and
the Critical Angular Velocity for Fly-off From the Table
III. Rotating Reference Frames
A. Playing Catch on a Merry-Go-Round [adapted from Evans (1982)].
B. Cyclone and Bathtub Vortices [See Hake (1994).] A plastic-pail
bathtub is placed on a giant merry-go-round with an angular velocity
omega about 10^4 greater than that of the Earth. Merry-go-round
rotations simulating northern and southern hemispheres then result in
water vortices around the drain that are, respectively, consistently
counterclockwise and clockwise.
REFERENCES
Evans, L. 1982. "The Coriolis Effect and other Spin-Off
Demonstrations," Phys. Teach. 20: 102.
Hake, R.R. 1992. "Socratic pedagogy in the introductory physics lab,"
Phys. Teach. 30: 546-552; updated version (4/27/98) online as ref. 23
at <http://www.physics.indiana.edu/~hake>.
Hake, R.R. 1994. "More on Coriolis myths and draining bathtubs," Am.
J. Phys. 62(12): 1063.
Hake, R.R. 1998. Socratic Dialogue Inducing (SDI) Lab #3 "Circular
Motion and Frictional Forces," online at
<http://www.physics.indiana.edu/~sdi>. A Teacher's Guide is online at
the Harvard Galileo site <http://galileo.harvard.edu/> under Hands-On
Methods/SDI Labs/Resources/Teacher's Guides, where "/" means click on
the following text.
Hake. R.R. 2002. "Socratic Dialogue Inducing Laboratory Workshop,"
"Proceedings of the UNESCO-ASPEN Workshop on Active Learning in
Physics," Univ. of Peradeniya, Sri Lanka, 2-4 Dec. 2002;
also online as ref. 28 at <http://www.physics.indiana.edu/~hake/>.
[ASPEN = ASian Physics Education Network
<http://www.swin.edu.au/physics/aspen/welcome.htm>.]