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Related Concept Videos

Controller Configurations01:22

Controller Configurations

Controller configurations are crucial in a car's cruise control system because they manage speed over time to maintain a consistent pace regardless of road conditions, thereby meeting design goals. In traditional control systems, fixed-configuration design involves predetermined controller placement. System performance modifications are known as compensation.
Control-system compensation involves various configurations, most commonly series or cascade compensation, in which the controller aligns...
Design of Transmission Shafts01:16

Design of Transmission Shafts

The design of a transmission shaft is governed by two primary specifications: the power it transmits and its rotational speed. These parameters guide the selection of the shaft's material and cross-sectional dimensions, ensuring that the material's maximum shearing stress remains within the elastic limit while transmitting the desired power at the given speed. The system's power is intrinsically linked to the applied torque. The torque applied to the shaft can be calculated by reconfiguring the...
Journal Bearings01:23

Journal Bearings

Journal bearings are mechanical components that support and provide lateral stability to rotating shafts and axles. They are crucial in reducing friction, wear, and vibration in machinery such as engines, turbines, and pumps. The principle behind journal bearings is forming a thin lubricant film between the bearing surface and the rotating shaft, which minimizes direct contact and reduces frictional forces.
To better understand the concept of journal bearings, consider a rope winch with dry or...
Design Consideration01:22

Design Consideration

Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key aspect...
Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
Next, use bending moment diagrams for the shaft to...
Scatter Plot01:15

Scatter Plot

The most common and easiest way to display the relationship between two variables, x and y, is a scatter plot. A scatter plot shows the direction of a relationship between the variables. A clear direction happens when there is either:

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Related Experiment Video

Updated: Jul 3, 2026

Importance of Jumping Ability in Handball Throwing Speed and Accuracy
02:43

Importance of Jumping Ability in Handball Throwing Speed and Accuracy

Published on: April 4, 2025

The relationship between discus throwing performance and combinations of selected technical parameters.

Steve Leigh1, Michael T Gross, Li Li

  • 1Center for Human Movement Science, Division of Physical Therapy, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7135, USA.

Sports Biomechanics
|July 10, 2008
PubMed
Summary

This study analyzed discus throwing technique, finding specific body movements significantly correlate with performance. Optimizing hip-shoulder separation and arm elevation can improve discus throw distance.

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Area of Science:

  • Sports Biomechanics
  • Athletic Performance Analysis

Background:

  • Discus throwing success depends on complex biomechanical factors.
  • Understanding the relationship between technique and performance is crucial for training.

Purpose of the Study:

  • To investigate the correlation between discus throwing performance and key technical parameters.
  • To identify specific technical elements influencing throwing success in male and female athletes.

Main Methods:

  • Collected 3D videographic data of 51 male and 53 female discus throwers.
  • Analyzed 21 body landmarks and discus trajectory using direct linear transformation.
  • Applied hierarchical stepwise multiple regression and canonical correlations to assess technical parameter influence.

Main Results:

  • Identified significant relationships between hip-shoulder separation, arm elevation angles, and throwing performance.
  • Specific technical combinations were found to be strongly associated with better discus throws.
  • Gender-specific technical analyses revealed distinct performance determinants.

Conclusions:

  • Effective discus throwing technique involves optimizing specific kinematic parameters like separation and angles.
  • Findings provide insights for targeted training interventions to enhance throwing performance.
  • Controlling release height and vertical velocity through technique is key for maximizing distance.