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Related Concept Videos

Torque01:10

Torque

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Torque is an important quantity for describing the dynamics of a rotating rigid body. We see the application of torque in many ways in the world, such as when pressing the accelerator in a car, which causes the engine to apply additional torque on the drivetrain. Here, we define torque and provide a framework to create an equation to calculate torque for a rigid body with fixed-axis rotation.
Torque can be considered as the rotational counterpart to force. Since forces change the translational...
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Torque Free Motion01:15

Torque Free Motion

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The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...
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Net Torque Calculations01:19

Net Torque Calculations

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When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...
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Kinematic Equations - I01:26

Kinematic Equations - I

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When an object moves with constant acceleration, the velocity of the object changes at a constant rate throughout the motion. The kinematic equations of motions are derived for such cases where the acceleration of the object is constant. The first kinematic equation gives an insight into the relationship between velocity, acceleration, and time. We can see, for example:
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Structural Joints: Synovial Joints01:16

Structural Joints: Synovial Joints

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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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Structural Joints: Fibrous Joints01:03

Structural Joints: Fibrous Joints

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Fibrous joints are a type of joint where the bones are connected by fibrous connective tissue. These joints provide stability and minimal to no movement between the articulating bones. There are three types of fibrous joints.
Suture
All the bones of the skull, except for the mandible, are joined to each other by a fibrous joint called a suture. The fibrous connective tissue found at a suture strongly unites the adjacent skull bones and thus helps to protect the brain and form the face. In...
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Related Experiment Video

Updated: Jan 23, 2026

An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
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Simultaneous Floating-Base Estimation of Human Kinematics and Joint Torques.

Claudia Latella1, Silvio Traversaro2, Diego Ferigo3,4

  • 1Dynamic Interaction Control at Istituto Italiano di Tecnologia, Center for Robotics and Intelligent Systems, Via San Quirico 19D, 16163 Genoa, Italy. claudia.latella@iit.it.

Sensors (Basel, Switzerland)
|June 26, 2019
PubMed
Summary

This study introduces a new stochastic method for estimating human body movement and forces, building on prior fixed-base work. Experimental validation confirms the accuracy of this advanced floating-base approach for motion analysis.

Keywords:
floating-base dynamics estimationhuman joint torque analysishuman wearable dynamics

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Area of Science:

  • Biomechanics
  • Robotics
  • Human Motion Analysis

Background:

  • Previous research developed a fixed-base formulation for human estimation.
  • Accurate estimation of human kinematics and dynamics is crucial for various applications.

Purpose of the Study:

  • To present a stochastic methodology for simultaneous floating-base estimation of human whole-body kinematics and dynamics.
  • To extend previous fixed-base formulations to a more comprehensive floating-base approach.

Main Methods:

  • Developed a stochastic methodology for floating-base estimation.
  • Utilized a wearable motion tracking system and force/torque sensors in shoes.
  • Collected experimental data from a healthy subject performing motion tasks like treadmill walking.

Main Results:

  • The floating-base approach successfully estimated joint torques, internal forces, and external forces.
  • Comparison with fixed-base estimates showed satisfactory agreement.
  • Experimental validation confirmed the efficacy of the presented methodology.

Conclusions:

  • The stochastic floating-base methodology provides accurate estimation of human whole-body kinematics and dynamics.
  • This approach enhances previous fixed-base methods for human motion analysis.
  • The validated method has potential applications in biomechanics and human-robot interaction.