3 ms·
Could someone explain who their robot isn't violating conservation of angular momentum? That seems key to understanding it.
by sacrosancty 4y ago
Could someone explain who their robot isn't violating conservation of angular momentum? That seems key to understanding it.
- ben_w 4y agoIANAP, but I think conservation laws are always equivalent to some symmetry (space translation, time translation, rotation, etc), so if one of those symmetries doesn't hold in a curved space, the corresponding conservation law just doesn't hold.
- meltyness 4y agoThey simply argue that by maximizing the inertia of the sphere during the motion along the lateral arms, motion can be favored in that direction. Here's the concept you're most likely missing, as taught and demonstrated by Walter Lewin https://www.youtube.com/watch?v=lvfzdibrUFA https://www.youtube.com/watch?v=lvfzdibrUFA
- MauranKilom 4y agoA cat righting itself in free fall also manages to do so without violating conservation of angular momentum: https://en.m.wikipedia.org/wiki/Falling_cat_problem https://en.m.wikipedia.org/wiki/Falling_cat_problem The more general term/field is https://en.m.wikipedia.org/wiki/Nonholonomic_system https://en.m.wikipedia.org/wiki/Nonholonomic_system.