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Related Concept Videos

Method of Joints: Problem Solving II01:30

Method of Joints: Problem Solving II

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Consider a truss structure with frictionless joints fixed to a wall and roller support. If a force of 150 N is applied to joint A, the forces in each member of the truss can be determined using the method of joints.
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Method of Joints: Problem Solving I01:30

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The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint. Consider a truss structure with two forces of 20 N and 10 N acting at joints C and D, respectively. The method of joints can be used to determine the forces FCB, FDC,...
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Structural Joints: Synovial Joints01:16

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Synovial joints are the most common type of joint in the body. A key structural characteristic for a synovial joint is the presence of a joint cavity. This fluid-filled space is where the articulating surfaces of the bones contact each other. Also, unlike fibrous or cartilaginous joints, the articulating bone surfaces at a synovial joint are not directly connected to each other with fibrous connective tissue or cartilage. This gives the bones of a synovial joint the ability to move smoothly...
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Method of Joints01:30

Method of Joints

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The method of joints is a commonly used technique to analyze the forces in structural trusses. The method is based on the principle of equilibrium, which assumes that the truss members are connected by frictionless pins. The forces at each joint can be determined by considering the equilibrium of the forces acting on that joint.
Since plane truss members are in the same plane, each joint is subjected to a coplanar and concurrent force system. To apply the method of joints, the first step is to...
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Functional Classification of Joints01:09

Functional Classification of Joints

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Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An...
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Circular Shafts - Elastoplastic Materials01:24

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The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
As torque on the...
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Related Experiment Video

Updated: Mar 8, 2026

Quantifying Learning in Young Infants: Tracking Leg Actions During a Discovery-learning Task
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Transferability between Isolated Joint Torques and a Maximum Polyarticular Task: A Preliminary Study.

Antony Costes1, David Villeger1, Pierre Moretto2

  • 1PRISSMH, University of Toulouse, UPS, Toulouse, France.

Journal of Human Kinetics
|February 3, 2017
PubMed
Summary
This summary is machine-generated.

Isolated joint torque capabilities do not directly correlate with performance in complex cycling tasks. However, maximum knee extension torque at slow speeds is linked to higher cycling power.

Keywords:
cyclingforce-velocity testinverse dynamicsisokinetic ergometer

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Area of Science:

  • Biomechanics
  • Sports Science
  • Human Movement

Background:

  • Understanding the relationship between isolated joint strength and whole-body dynamic performance is crucial for optimizing athletic training.
  • Previous research has often assumed a direct transfer of force capabilities from isolated movements to complex, multi-joint activities like cycling.

Purpose of the Study:

  • To investigate the correlation between maximum isolated joint torques and joint torques during maximal cycling power output.
  • To determine if isolated, slow-velocity joint torque production relates to overall cycling power generation.

Main Methods:

  • Nine cyclists underwent two assessments: maximum isolated joint torques using an isokinetic ergometer and maximum pedaling torques calculated via inverse dynamics during maximal cycling.
  • Correlation analyses were performed between isolated and pedaling torques across multiple joints (ankle, knee, hip) and movement directions (flexion, extension).

Main Results:

  • No significant correlations were found between maximum isolated joint torques and maximum pedaling torques across the analyzed joints and movements.
  • A significant positive correlation (r=0.68, p<0.05) was observed between maximal cycling power and isolated knee extension torque measured at slow angular velocity.

Conclusions:

  • Isolated joint torque measurements at slow velocities do not directly predict torque production during dynamic, multi-joint cycling tasks.
  • Differences in joint angular velocities and mono-articular versus polyarticular contributions explain the lack of direct correlation.
  • Maximum cycling power is significantly associated with the capacity for high torque production in knee extension at slow speeds.