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At every points of a static equilibrium system, the net force is zero. If oneof the composite forces of this system is disappeared, it is no more inequilibrium and this effect of absence spreads through the system with a finitevelocity. So it takes finite time before this absence is manifest at the otherpoints. A frequently asked question may describe this situation well. ``If theSun disappears abruptly, does this affect us instantly?" In this questioncentripetal force due to the gravity of the Sun does not disappearsimultaneously all over the place, so the Earth sustains its elliptical motionfor a while. As this example shows, it is a well known fact that the force doesspread with a finite velocity. But for the specific problems it is sometimesnot easy to notice this property of the force. To help this, we consider themotion of a falling spring and a falling catenary. We study the conceptualaspects of these motions and apply it to the experimental data. A minimaltheoretical background is also treated. For the future, we anticipate that thiswork would be useful for enhancing the concept of wave motion.

Falling spring and falling catenary as cases of force propagation