The Physics of Belay Devices | When their Assistance Fails?

Physics and Experiments demonstrating Assisted Belay Devices fail situations.
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Physics of GriGri Episode:
https://youtu.be/We-nxljgnw4

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00:00 Introduction
00:48 Physics
06:25 Experiment #1 Hand Above the Device
12:15 Experiment #2 Fall While giving Slack
15:24 Experiment #3 No Slack Fall
20:44 Conclusion
23:02 Ad

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A huge thank you to those who helped me to understand this topic:
Prof. Pietro Meschini
Prof. Rainer Schad

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Deep Thanks!
Ben