- Jul 29, 2013
- 1,200
- 63
I answering the questions individually and you want to know how the movements relate to each other.
Firstly, the sling is spinning around a somewhat stationary axis, its extension is because of the constant change in direction of the pulling force. It constantly accelerates even though the rational speed remains the same because of the directional change. The momentum decreases if the radius gets larger (extends)
The whip uses an advancing axis that moves down the length of the whip and increases in speed as it progresses because the momentum is conserved and squeezed into a smaller and smaller medium. The movement is a wave. If you watch it in slow motion, there is a rotational component in the same manner that the sling is spun by change of direction but the driving movement stops and the wave continues and accelerates.
The whip accelerates because of conservation of momentum from big to small. This wouldn't cause acceleration in a bat because the mass is greater as you move away from the handle.
I describe lag as the resistance to change of direction that causes a bending moment as the handle is torqued.
I describe bat drag as the movement of pulling the knob of the bat linearly.
The whip movement is due to change in direction of the pulling force, not the stopping of the force. Pull a whip by its handle and stop and all that happens is the small end bunches up behind the big end. Think water skier dragging behind a boat. Now if that boat suddenly turns, the water skier will experience centripetal force, accelerate in the direction of the turn and woohooo!!!!!! The whip turns sharply(u turn) ...momentum is conserved and acceleration happens.....
But if you put a mass at the end of the whip, I don't think the result would be what you'd see with the sling.
I still am not sure how you don't think there is whip in the swing. Are you stating that Miggy's swing is purely rotational? If we need to move this to practical i will, because i dont think i know all the big words.
Your bat drag is a straight linear pull. That is not what i am saying. I am agreeing that there is a slight rotational element to the swing around the core locked, or connected, to the torso. that allows the whip to happen. it is not end over end. It is not the human centipede of hitting.
The bat isn't being pulled directly upon itself. It is being turned by the torso then released to extension to the pitch and whipped to contact. Are you seeing something different with the Miggy video i posted?
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Is there whip in the swing? What is the motion of a whip? Look at the video I posted and tell me how swinging a bat is like a whip.
Then look at the video of the sling and tell me how swinging a bat is similar/disimilar.
The bat being "turned by the torso, released to extension and whipped to contact" is one way of swinging.
I prefer to think what you described as:
1. Holding the bat from extending radially due to centripetal force applied as the torso turns
2. Allowing the rotational acceleration to extend the bat radially
3. Reducing the turning radius of the hands so the barrel accelerates rotationally
I like the concept of a sling swinging slowly around my head and then swinging it with a smaller hand movement to accelerate the rotation. The hand movements are both rotational but the faster one travels in a smaller circle. You might define the final movement as "whipping" the sling
Ok?