In the shown configuration, the output voltage increases with increasing force.
If RFSR and RM are swapped, the output swing will decrease with increasing force.
The measuring resistor, RM, is chosen to maximize the desired force sensitivity
range and to limit current. Depending on the impedance requirements of the
measuring circuit, the voltage divider could be followed by an op-amp.
A family of force vs. VOUT curves is shown on the graph below for a standard FSR
in a voltage divider configuration with various RM resistors. A (V+) of +5V was
used for these examples.