A vertical chain is released from rest with its lower end just touching a table. Its motion is analyzed, then the total force acting on the chain by the table is found as a function of the amount of the fall.
( The full playlist "Introductory Physics" is at
https://www.youtube.com/playlist?list=PLV36j4vp1RdnNHWx9GaCqQ7mZkUefs4lM )
