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Related Concept Videos

Hydraulic Jump: Problem Solving01:16

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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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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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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.
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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.
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A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
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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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Related Experiment Video

Updated: Dec 8, 2025

A Novel Application of Musculoskeletal Ultrasound Imaging
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Temporal Kinematic Differences between Forward and Backward Jump-Landing.

Datao Xu1, Xuanzhen Cen1, Meizi Wang2

  • 1Faculty of Sports Science, Ningbo University, Ningbo 315211, China.

International Journal of Environmental Research and Public Health
|September 16, 2020
PubMed
Summary
This summary is machine-generated.

Backward jump-landing poses a higher injury risk due to reduced hip and knee flexion. Increasing flexion during backward landings may help prevent injuries like anterior cruciate ligament (ACL) tears.

Keywords:
backward jump-landingknee flexionnon-contact ACL injuriesstatistical parametric mapping (SPM)temporal kinematic

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Area of Science:

  • Biomechanics
  • Sports Science
  • Injury Prevention

Background:

  • Backward jump-landing is under-researched compared to forward landing.
  • Dynamic postural instability during backward landings increases injury risk.

Purpose of the Study:

  • To compare lower extremity kinematics between forward and backward jump-landings.
  • To analyze differences in single-leg and double-leg backward jump-landings.

Main Methods:

  • Kinematic data collected during forward and backward jump-landings (single and double leg).
  • Statistical Parametric Mapping (SPM) analysis used.
  • 45 participants analyzed.

Main Results:

  • Backward jump-landing showed less hip and knee flexion compared to forward.
  • Backward landings exhibited greater vertical ground reactive force (VGRF).
  • Key kinematic differences occurred within 30-50 ms of landing.

Conclusions:

  • Backward jump-landing involves biomechanical patterns associated with higher injury risk.
  • Increased hip and knee flexion during backward landings is recommended for injury prevention.