52
Chapt. 5
Newton’s Laws and Dynamics I
the object that start at two points used as pivot points and that go in the direction through
the object that was downward when each of the points was the pivot point. The method fails
if the two pivot points and the center of mass happen to be collinear.”
a) What is an
EMPIRICAL
method for finding gravitational torque, Alex?
b) What is a
THEORETICAL
method for finding gravitational torque, Alex?
c) What is gravitational torque, Alex?
d) What is a center of mass, Alex?
e) What is an
EMPIRICAL
method for finding the center of mass of a rigid object, Alex?
005 qmult 00670 1 5 5 easy thinking: hanger center of mass
30. Where, roughly speaking, is the center of mass of a coat hanger?
HINT:
Imagine letting it
hang from two different free pivot points: this is called a Gedanken (thought) experiment in
physics speak. If you arn’t in a test
mise en sc`
ene
, you could actually do the experiment.
a) At the end of the hook.
b) At the top of the hook.
c) At the left end of the triangular loop.
d) Nowhere since a center of mass must be physically inside an object to be a center of mass.
e) Oh, somewhere not so far from the middle region of the triangular loop.
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 Fall '06
 Buchler
 Physics, Force, Mass, General Relativity, Fundamental physics concepts

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