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-----Original Message-----
From: phys-l@lists.nau.edu: Forum for Physics Educators
[mailto:PHYS-L@LISTS.NAU.EDU]On Behalf Of Rick Tarara
{When this kind of lab is done with my science majors, they have worked with
the modified Atwood's machine problem prior to the lab and thus are familiar
with this idea of transferring the vertical force to the horizontal
direction. For my non-science majors, they never question the assumption
that the falling mass provides the force that is pulling horizontally on the
cart. ;-) }