Related Experiment Video
Updated: Jan 17, 2026
06:36
Biomechanical Analysis Methods to Assess Professional Badminton Players' Lunge Performance
Published on: June 11, 2019
11.3K
Analyzing angular momentum in the takeoff phase of medium-hill ski jumping
Yuta Funato1, Hirotaka Nakashima2, Shinji Sakurai3
1Graduate School of Health and Sport Sciences, Chukyo University, Toyota, Japan.
Frontiers in Sports and Active Living
|September 17, 2025
Summary
Ski jumpers should aim for an angular momentum of the center of gravity (AMCG) around 0.0391 s⁻¹ at takeoff. This finding provides objective coaching indicators for improving ski jumping performance and jump distance.
Area of Science:
- Sports Science
- Biomechanics
Background:
- Competitive ski jumping performance relies on jump distance and style.
- The influence of angular momentum on ski jumping, especially during takeoff, is not well understood.
Purpose of the Study:
- To quantify angular momentum during the takeoff phase in ski jumping.
- To determine the optimal angular momentum for maximizing jump distance.
Main Methods:
- Analyzed the angular momentum of the center of gravity (AMCG) of the jumper-ski system in the sagittal plane.
- Used high-speed cameras (200 Hz) to film 21 ski jumpers (16 male, 5 female) on a medium hill.
Main Results:
- A significant quadratic relationship was found between AMCG at takeoff and jump distance.
- The optimal AMCG value at the apex of the takeoff phase was determined to be approximately 0.0391 s⁻¹ (p < 0.05).
Conclusions:
- The study identifies an appropriate AMCG value of 0.0391 s⁻¹ for optimal ski jumping takeoff.
- These findings offer objective biomechanical indicators for ski jumping coaching and performance enhancement.
Related Concept Videos
01:21Angular Momentum
756
Angular momentum characterizes an object's rotational motion and is defined as the moment of its linear momentum about a specified point O. When a particle moves along a curved path in the x-y plane, the scalar formulation calculates the magnitude of its angular momentum, utilizing the moment arm (d), representing the perpendicular distance from point O to the line of action of the linear momentum. Despite being scalar in formulation, angular momentum is inherently a vector quantity. Its...
756
01:18Conservation of Angular Momentum: Application
12.2K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a...
12.2K
01:09Conservation of Angular Momentum
15.9K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Considering a system that consists of n tiny particles, the angular momentum of any tiny particle may change, but the system's total angular momentum would remain constant. The principle of conservation of angular momentum only considers the net external torque acting on the system. While there are internal forces exerted by different particles within the system that also produce...
15.9K
01:09Angular Momentum and Principle Axes of Inertia
533
The concept of angular momentum for a solid structure is illustrated as the cumulative result of the cross-product of the position vector of the mass element and the cross-product of the body's angular velocity with the position vector.
To put this equation into simpler terms, it can be reconfigured using rectangular coordinates. This involves choosing an alternative set of XYZ axes that are arbitrarily inclined with respect to the reference frame. The process of deriving the rectangular...
To put this equation into simpler terms, it can be reconfigured using rectangular coordinates. This involves choosing an alternative set of XYZ axes that are arbitrarily inclined with respect to the reference frame. The process of deriving the rectangular...
533
01:19Principle of Angular Impulse and Momentum: Problem Solving
480
Consider a ball of mass m, attached to a massless rod of known length, subjected to a time-dependent torque. If the initial velocity of the mass is known, then the final velocity of the mass for time t can be determined using the principle of angular impulse and momentum.
Initially, a free-body diagram of the system is drawn to illustrate all the forces acting upon the system, providing a crucial understanding of the dynamics at play. Then, the principle of angular impulse and momentum is...
Initially, a free-body diagram of the system is drawn to illustrate all the forces acting upon the system, providing a crucial understanding of the dynamics at play. Then, the principle of angular impulse and momentum is...
480
01:23Principle of Angular Impulse and Momentum
1.2K
The angular impulse and momentum principle provides insights into how forces applied at a distance from an object's rotational axis influence its angular velocity. It builds upon the crucial relationship between the moment of force and angular momentum. By integrating this equation, substituting the limits for the initial and final times, a comprehensive expression representing the angular impulse and momentum principle is derived.
1.2K