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Related Concept Videos

Hydraulic Jump01:29

Hydraulic Jump

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A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...
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Types of Damping01:20

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If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
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The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
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Damped Oscillations01:07

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In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
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To analyze a hydraulic jump in a rectangular channel with a flow speed of 6 meters per second, follow these steps:Calculate Effective Upstream Velocity:When the downstream gate closes, a hydraulic jump forms, traveling upstream at 2 meters per second. This wave speed combines with the initial channel flow velocity, creating an effective upstream velocity.Identify Flow Velocities Before and After the Hydraulic Jump:Upstream of the hydraulic jump, the effective flow velocity includes both the...
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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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Related Experiment Video

Updated: Mar 16, 2026

Non-invasive Assessments of Subjective and Objective Recovery Characteristics Following an Exhaustive Jump Protocol
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Lower-limb damping characteristics during various repetitive jumping forms: Reliability and sensitivity analysis.

Marko Kapeleti1, Marc Elmeua González2, Igor Zlatović1

  • 1Faculty of Sport and Physical Education, University of Belgrade, Belgrade, Serbia.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|March 14, 2026
PubMed
Summary

Damping ratios reliably measure impact force control during jumping and hopping. This study establishes a reliable method for using damping ratios in biomechanical analysis for sports training and rehabilitation.

Keywords:
Impact absorptionIntraclass correlation coefficientOscillationStiffnessStretch–shortening cycle

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Sports Science

Background:

  • Controlling impact forces is crucial for jumping performance.
  • The damping ratio quantifies oscillation decay and is a key measure of impact control.
  • Understanding the reliability and sensitivity of damping ratios is essential for biomechanical analysis.

Purpose of the Study:

  • To assess the intra-session and inter-session reliability of damping ratios at various lower-limb anatomical landmarks.
  • To evaluate the sensitivity of damping ratios in distinguishing between different repetitive jumping forms (CMJ, BL HOP, UL HOP).
  • To establish a specific methodological approach for reliable damping ratio analysis.

Main Methods:

  • Twenty-three participants performed maximal countermovement jumps (CMJs) and bilateral (BL) and unilateral (UL) hopping (HOP).
  • Ten wireless inertial measurement units recorded data from five bilateral lower-limb anatomical landmarks.
  • Damping ratios were calculated and analyzed for reliability and sensitivity across different jump types and anatomical locations.

Main Results:

  • Damping ratios showed good intra-session and inter-session reliability for CMJ and HOPUL, and moderate reliability for HOPBL.
  • Significant differences in damping ratios were observed between CMJ, HOPBL, and HOPUL across most anatomical landmarks.
  • CMJ exhibited the highest damping ratios, HOPBL the lowest, and HOPUL intermediate values, influenced by joint stiffness, displacement, and stretch-shortening cycle utilization.

Conclusions:

  • A methodological approach using 20 repetitions per intra-session trial and averaging bilateral data for inter-session reliability is acceptably reliable and sensitive.
  • Damping ratios are a valuable metric for biomechanical analysis of jumping and hopping, with potential applications in sports training and rehabilitation.
  • This metric can contribute to developing theoretical models and enhancing practical biomechanical assessments.