Hey all,
I want to preface that before we dive into this stuff on resultants, friction and direction of vector forces… this is tough stuff. The reason I am bringing this out in the open, is because it is critically important to understand. Not just slightly important, but critically important! Why? The very ground you walk on and the balancing act you perform with every step, falls 100% inline (pun intended) with what we are going to be going through. No one “really” contemplates vector angles, friction, resultants and such with every step or bounding leap (during a run) do they? Well, (admittedly) I do sometimes… but then again, I am a bit of an “odd bird” at times. But really, few do. And it is because of this, we need to understand why we don’t fall down when we are about “locomotion”.
Our bodies are created fearfully and wonderfully. We have automatic feedback systems with virtually everything we do. Visually, tactically and kinesthetically… we move through space with (mostly) the greatest of ease. Our mind, body, soul and spirit direct and reflect our thoughts, intentions and actions. So when we must think for ourselves, such as what we are about to jump into, it isn’t automatic for us. We need to process it.. touch, feel, see and… understand.
So when does a resultant not follow the normal rules of bifurcating two “components” thereby making a new force vector or vector angle? Give up? Or come one! Everyone knows that when a haul line is directly attached to (say) a gin pole via a winch… the resultant runs right down the monopod. No? Well, for the longest time… I didn’t either. Not only that, it confused me as to why. Well, like in so many other examples, Rich Delaney explains (in simple terms) why this is so.
The frame mounted winch along with the opposing compression and tension elements on the frame actually cancel each other out. Suppose the haulers are in exact alignment with winch… ? Would you still have the same resultant as if the winch was doing the haul (while attached to the leg of the high directional)? Nope! At this point the resultant would follow the “normal” line of splitting the load line (component 1) and haul line (component 2).
What about friction, quality of rope, properties of pulleys, capstan equation and resultants? These all come into play when we set up systems such as one using an article or natural hight directional. So settle in with some coffee or tea and have a go with Rich and his thoughts… Eye opening for sure!!!!
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Peace on your days…
Lance
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