is original data taken by a group of Actual Physics Teachers studying
the setup in the illustration. We hung a cord between two force
probes, and then hung a weight from a (variable) place on the cord.
The probes were free to rotate, and were level with one another.
F1 and F2 are forces in Newtons
measured by the force probes. X1, X2,
and h are distances in meters, as shown. We moved
the weight between observations.
What is the mass of the weight?
We expect the components of the vectors to balance. Do they?