The player steers two variables, friction does the rest: why your stock stops exactly where it stops — and what that means for diagnosing errors.
Physically the matter is short: your delivery gives the stock an initial velocity and a direction — after that sliding friction decelerates it with a calculable negative acceleration until it stops [1]. That is all. Two variables come from you, everything else comes from the surface.
And then comes the sentence that turns this guide into a diagnosis: in real use the friction coefficient varies enormously — with the Shore hardness of your running sole, with ice temperature and with surface condition, meaning prepared grooved ice versus smooth natural ice [1]. If your stock runs too far today and ran short yesterday, that is not automatically your swing.
Honestly up front, because otherwise this guide would promise more than the source base supports: for ice stock sport there is not a single kinematic or kinetic measurement of the delivery — no force measurement, no angle measurement, no velocity measurement. So there are no target values in degrees, seconds or metres per second here. What there is, is a clean physical chain and a materials knowledge that explains what you can actually adjust.
The delivery is an acyclic movement from a static stance, preceded by a repeated backswing [3]. From the federation teaching: right standing leg slightly angled to the direction of play, left supporting leg pointing in the direction of play, both legs extended during the backswing phase, upper body upright, shoulder girdle parallel to the rear boundary line; the grip encloses the handle from behind, with the thumb resting on top at the front [3].
And then your influence ends — literally: the handle must have left the player's hand at the latest after the first lunge step; running along further or pushing the stock invalidates the attempt [4]. From that moment the stock belongs to physics.
From release onwards a simple chain applies [1]: the stock has an initial velocity. Sliding friction produces a deceleration. The stock comes to a standstill.
That is exactly why distance is a question of velocity at release, not of force at the end. In practice you meter it through swing length, which the technique doctrine puts at about 60 centimetres to one metre [6] — a practical corridor, not a biomechanical target value.
The hardness of the running plate determines how strongly the stock is braked [2]: a softer plate has more frictional resistance, glides more heavily — but forgives inaccuracies in the swing. A hard plate glides aggressively and far and demands excellent distance control [2].
What the source base explicitly does not provide: characteristic curves plotting pressure against friction, or a numerical value for an ice stock's friction coefficient. An idealised value appears in the didactic worked examples that is not legible in the available version [1] — and nothing is guessed here. The relationship "harder equals faster" stays qualitative. For practice that is entirely enough.
Ice temperature and surface change the friction coefficient considerably [1]. Grooved ice — milled by the ice machine with 5-millimetre-deep grooves across the direction of play [3] — behaves differently from smooth natural ice [1].
Practical consequence: a freshly prepared lane is a new lane. Anyone who keeps playing the distances of the last end after ice preparation misses the target — and takes it for a technique error.
From the chain follows a three-step check to run through on every distance deviation:
This separation is the real value of this guide: it takes the guilt out of deviations that do not come from your movement at all.
A look over the fence, explicitly flagged as transfer: in curling and motor-learning research it is described that beginners rigidly fix their joint degrees of freedom ("freezing degrees of freedom"), while experienced athletes release that rigidity and transfer energy fluidly across several joints [5].
That is a general motor-learning principle and fits the picture of a clenched beginner's swing — but for stock sport it is a plausible hypothesis, not a finding, and it supplies not a single number [5]. How big the difference is, nobody knows: curling has three-dimensional movement measurements [7], stock sport has none — and a direct transfer of curling kinematics would be inadmissible, because there the whole body glides while here the delivery comes from a stance [7].
Physics also applies to the stock that does not end up near you: a piece of equipment with low friction and several kilograms of mass keeps its energy over long distances. So the rule stays absolute: nobody steps onto the running lane while a stock is in motion, and neighbouring lanes belong separated.
For yourself, the lunge step is the loading point: firm stance, grippy footwear, a short warm-up of legs, hips and throwing shoulder. And since there was a lot of talk about material here: a loose handle or a badly seated running plate is not a technique problem but a safety problem — check before the session.
This guide explains physics and material, it never replaces a supervised club or course where someone watches your delivery in real time.
Run a blind test against yourself once: have a club mate mount two plates of different hardness on the same stock without telling you which is on. Play six attempts each with an identical swing length and note the distances. You will see the difference in the numbers before you feel it [2] — and after that you will never pick a sole "by colour" again.
Because you steer only two things: initial velocity and direction. After that sliding friction decides where the stock comes to rest [1]. And that frictional resistance depends on sole hardness, ice temperature and surface [1][2] — so it changes while your technique stays the same.
Because the lane has changed. In practice the friction coefficient varies strongly with ice temperature and surface condition; freshly milled grooved ice with its 5-millimetre-deep grooves runs differently from smooth natural ice [1][3]. Consequence: recalibrate after every ice preparation.
It depends on what you need. Softer plates have more frictional resistance, glide more heavily and forgive inaccuracies in the swing; hard plates glide aggressively and far and demand excellent distance control [2]. For beginners, softer is the more controllable choice.
No. The handle must have left your hand at the latest after the first lunge step; running along further or pushing invalidates the attempt [4]. Physically that is also the point where your influence ends — everything after it is friction [1].
No. For this sport no published kinematic or kinetic measurements of the delivery exist — no angles, no forces, no velocities. Curling has three-dimensional movement analyses [7], but the delivery there is a whole-body gliding process and cannot be transferred [7]. Anything more would be invented.
Practising instead of playing: what a training session looks like