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Related Concept Videos

Kinematic Equations - III01:18

Kinematic Equations - III

The first two kinematic equations have time as a variable, but the third kinematic equation is independent of time. This equation expresses final velocity as a function of the acceleration and distance over which it acts. The fourth kinematic equation does not have an acceleration term and provides the final position of the object at time t in terms of the initial and final velocities. This equation is useful when the value of the constant acceleration is unknown.
Using the kinematic equations,...
Kinematic Equations - II01:17

Kinematic Equations - II

The second kinematic equation expresses the final position of an object in terms of its initial position, the distance traveled with the initial constant velocity, and the distance traveled due to a change in velocity. Similar to the first kinematic equation, this equation is also only valid when the acceleration is constant throughout the motion of an object.
Suppose a car merges into freeway traffic on a 200 m long ramp. If its initial velocity is 10 m/s and it accelerates at 2 m/s2, then the...
Kinematic Equations - I01:26

Kinematic Equations - I

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:
Kinematic Equations: Problem Solving01:15

Kinematic Equations: Problem Solving

When analyzing one-dimensional motion with constant acceleration, the problem-solving strategy involves identifying the known quantities and choosing the appropriate kinematic equations to solve for the unknowns. Either one or two kinematic equations are needed to solve for the unknowns, depending on the known and unknown quantities. Generally, the number of equations required is the same as the number of unknown quantities in the given example. Two-body pursuit problems always require two...

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Related Experiment Video

Updated: Jun 3, 2026

Method to Measure Tone of Axial and Proximal Muscle
10:41

Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

Multi-segment trunk kinematics during locomotion and elementary exercises.

Alberto Leardini1, Fabio Biagi, Andrea Merlo

  • 1Movement Analysis Laboratory, Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, Bologna, Italy. leardini@ior.it

Clinical Biomechanics (Bristol, Avon)
|March 23, 2011
PubMed
Summary

This study introduces a new technique for measuring multi-segmental trunk motion in healthy individuals. The findings reveal subject-specific movement patterns across all trunk segments during daily activities.

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3D Kinematic Gait Analysis for Preclinical Studies in Rodents
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3D Kinematic Gait Analysis for Preclinical Studies in Rodents

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Last Updated: Jun 3, 2026

Method to Measure Tone of Axial and Proximal Muscle
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Method to Measure Tone of Axial and Proximal Muscle

Published on: December 14, 2011

3D Kinematic Gait Analysis for Preclinical Studies in Rodents
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3D Kinematic Gait Analysis for Preclinical Studies in Rodents

Published on: August 3, 2019

Area of Science:

  • Biomechanics
  • Human motion analysis
  • Clinical assessment

Background:

  • Existing human trunk motion models are either oversimplified or technically complex.
  • A novel technique offers a balance between technical feasibility and clinical relevance for studying trunk motion.

Purpose of the Study:

  • To describe multi-segmental human trunk motion using a new, clinically relevant technique.
  • To analyze trunk segment movement during daily activities and specific exercises.

Main Methods:

  • A 14-marker system tracked thorax, shoulder, spine, and pelvic segments.
  • Motion was captured in 10 healthy subjects and 1 clinical case during various tasks.
  • Included static posture, sit-to-stand, step-ups, walking, and trunk rotations.

Main Results:

  • High intra-subject repeatability was observed for most measurements (e.g., spine rotations <1.8°, shoulder translations <1mm).
  • Significant and varied motion patterns were identified across all subjects and trunk segments.
  • Couplings between movements in the three anatomical planes were noted.

Conclusions:

  • Substantial subject-specific trunk motion occurs in all segments and planes during daily activities and exercises.
  • This new trunk motion model has potential for evaluating abnormal motion patterns in pathological conditions.