hierrezuelo physed 95 article
TRANSCRIPT
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Sliding
a
rollin
J
Hierrezuel
Mdaga),
Sp
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NEW A P P ROACH E S
shown
in
figure 1,
In
this stage the sphe
slips a t th e same time.
The
dynamic equ
describe this situation are
XF
=
Ma, =Ma
Z T / cy fr =
/
a
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of students errors, and therefore it
clear that, although there
is
a conne
translation and rotation, v,
rw
because
of
sliding.
From equations
6)
and (7) it can be
while the sphere is acquiring angular s
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NEW APPROACHE S
usually many times smaller than the slid
therefore balls and rollers are widely us
technical applications to reduce the fricti
surfaces.
Rigid rolling body moving freely on a
horizontal surface. This
is
the case of
a
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N E W
AP PROACHE S
Salazar A, SBnchez-Lavega A and Aman
1990
Is
the frictional force always oppo
motion? Phys.
Fduc
25 82-5
Shaw D 1979 Frictional force
on
rolling
J. P h F .
47
887-8