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-----Original Message-----
[mailto:PHYS-L@LISTS.NAU.EDU]On Behalf Of James W. Wheeler
And yet we do a force table lab (in my case before any N2 labs) in which
we assign the weight hung from the pulley to be the magnitude of a force
vector whose direction (in 2 dimensions) is measured with a protractor.
This is NOT a swindle, but assumes some degree of common sense or
experience.