Well, the experiment quite clearly shows the difference between a free pivot and a cable. I would also say, an imperfect experiment is better than no experiment at all.GrimSurfer wrote: ↑Wed Jan 18, 2023 8:23 amYou’ve done nothing more than put on a show and demonstrate that which on which we agree: That a skier can apply mass to the front of a ski by shifting weight forward.
@GrimSurfer Can you provide any evidence for your claims? By evidence, I mean empirical data.
GrimSurfer wrote: ↑Wed Jan 11, 2023 1:29 pm1. The binding, with cable attached, is in tension. This is what creates resistance to boot movement.tkarhu wrote: ↑Wed Jan 11, 2023 1:04 pmHeel lift power and binding resistance seem not to be opposing forces. Rather, a binding resistance allows some of a heel lift force to be transmitted to the tip of an attached ski. The more resistance, the more force seems to be transmitted. For this reason, it seems difficult to illustrate the forces as vector arrows in a fully realistic way.
Note -- I write ski tip here because "front ski" would not be exact either. At least ski tip is in front of a binding certainly. Further, it seems to even make sense to say that a cable or flexor creates a rotational power because without the piece a rotational force would not be created to a tip of a ski. See free pivot part of the illustration above. It is only one interpretation that word "create" implies a source of energy. Another interpretation could be that create expresses a comparison between two different bindings / systems.
2. Whatever mass is transmitted act on the front of the ski. This is because the whole front of the ski (less, perhaps, a bit of the pocket in a cambered ski) is in contact with the ground. The ski is not free to rotate, after all.
3. The mass applied to the front of the ski is the result of pressure provided by the skier’s weight. Nothing else “creates” this mass.
4. The angular distance between the normal force and mass applied by the skier is what creates force.
5. Force is nothing but mass and direction (or vector). This isn’t my definition. This is the accepted definition in physics.
6. Removing one (mass) or the other (vector) results in no force.
@GrimSurfer Would you please check your assumptions 3 and 4? Looks like there are other factors besides skier's weight. Cable seems to affect, how much of the skier's weight is actually transmitted as force to a front ski. This is also what I tried to illustrate earlier.
Still, everyone has their right for personal views. Yet for clarity and a shared understanding, it is good that we have empirical evidence, too. I believe what people show more than what people say.