To achieve a stable carved turn, the Gravitational Torque must be neutralized by an equal and opposite force. This is where Centrifugal Torque enters the dynamic equation as the primary balancing vector.
Now, what is the difference between “Centrifugal Force” and “Centrifugal Torque”? In physics, force moves an object, while torque rotates it. Here is the breakdown of the differences between these two concepts:
Centrifugal Force
Centrifugal force is the “apparent” force we feel pulling us outward from the center when moving in a circle. It pulls our entire body away from the curve. For example, when a car turns sharply to the left, our body is “pushed” against the right-side door. That sensation of being shoved sideways in a straight line is centrifugal force.
Centrifugal Torque
Centrifugal torque (often called “overturning moment”) occurs when that outward force is applied to a point that is not at ground level, causing the object to tip or rotate. It tries to “flip” us over. For example, we can think of a tall SUV taking a sharp turn. The centrifugal force pulls the SUV outward, but because the car is tall, that pull happens high up. This creates torque around the outer tires, which is why tall cars are at risk of rolling over (tipping) during a turn.
The Key Differences
As we carve a fast turn, centrifugal force is pulling on our upper body (high up) while our skis are fixed to the snow (low down), it tries to tip our body outward, flipping us over our outside ski. To stay balanced, we must lean inward to create a “gravitational torque” that cancels out the “centrifugal torque.”
Conclusion: the centrifugal force is the force always pushing us outwards. If it wins and we tip over, then it is called “centrifugal torque”.
The Torque Equilibrium
While gravity pulls us toward the ground (creating inward torque), the motion of the turn generates a centrifugal effect that pushes our center of mass toward the outside of the arc.
We are in “dynamic equilibrium” when the inward gravitational torque equals the outward centrifugal torque. When these forces are balanced, the resultant force vector points directly through our edges into the snow, providing maximum grip and stability.
Factors Affecting Centrifugal Torque
The magnitude of the centrifugal force depends on two main variables:
- Velocity: since centrifugal force is proportional to the square of the velocity, doubling our speed quadruples the outward force. This is why high-speed turns allow for much deeper inclination angles without falling.
- Turn Radius: a tighter radius (a sharper curve) increases centrifugal force, allowing us to counteract higher levels of gravitational torque even at moderate speeds.
Biomechanical Implications
If our velocity is too low for a given inclination, the centrifugal torque will be insufficient to balance gravity torque. In this scenario, we must rely exclusively on the Stabilizing Torque of the adductors and the rotational chain to “hold” the position. If the muscular capacity is exceeded, the kinetic chain collapses inward.
Conclusion: the centrifugal force acts as the dynamic counter-weight to gravity. In high-performance carving, we use speed and turn shape to generate a centrifugal vector that cancels out the Gravitational Torque, allowing for extreme edge angles that would be physically impossible in a static position.
