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Related Concept Videos

Impulse01:13

Impulse

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According to Newton’s second law of motion, the rate of change of the momentum of an object is the net external force acting on it. The total change in momentum between two timepoints thus depends on both the external force acting on it and the time over which it acts. Describing this mathematically, the total change of an object’s motion is proportional to the force vector and the time over which it is applied. This product is called impulse.
Additionally, it can be shown that the...
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Impulse-Momentum Theorem00:49

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The total change in the motion of an object is proportional to the total force vector acting on it and the time over which it acts. This product is called impulse, a vector quantity with the same direction as the total force acting on the object.
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Principle of Impulse and Moment01:15

Principle of Impulse and Moment

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When one considers a rigid body undergoing a plane motion, which is essentially a blend of translational and rotational movement, the application of Newton's second law gives the formula for the translational movement of such a body. If this equation is multiplied by a time interval, dt, and then integrated over the limits of integration, it results in an equation that embodies the principle of linear impulse.
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Two-Dimensional Force System

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A two-dimensional system in mechanical engineering involves the analysis of motion and forces in a plane. A two-dimensional force vector can be resolved into its components as:
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Static and Kinetic Frictional Force01:05

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One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
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Three-Dimensional Force System01:30

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In mechanical engineering, a three-dimensional force system is a system of forces acting in three dimensions, with forces applied along the x, y, and z coordinate axes. The three-dimensional force system is an important concept in mechanical engineering, as it allows engineers to understand and analyze the behavior of objects and structures in three dimensions. By understanding the forces acting on a system, engineers can design more efficient and effective mechanical systems that can withstand...
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Impulse-Based Dynamic Strength Index: Considering Time-Dependent Force Expression.

Michael H Haischer1,2, John Krzyszkowski3, Stuart Roche4

  • 1Department of Physical Therapy, Marquette University, Milwaukee, Wisconsin.

Journal of Strength and Conditioning Research
|March 29, 2021
PubMed
Summary

The impulse-based dynamic strength index (iDSI) may be a more accurate measure of athletic performance than the traditional peak force-based dynamic strength index (fDSI). This study found that iDSI better predicts dynamic performance and offers different training insights for athletes.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Strength and Conditioning

Background:

  • The dynamic strength index (DSI) assesses an athlete's ability to utilize maximal strength in dynamic movements.
  • Traditional DSI calculations rely on peak force, but force expression over time (impulse) is a stronger predictor of dynamic performance.

Purpose of the Study:

  • To investigate the correlation between DSI calculated using peak force (fDSI) and impulse (iDSI).
  • To determine if impulse-based DSI offers a more valid assessment of dynamic performance capacity.

Main Methods:

  • Nineteen female collegiate lacrosse players participated.
  • Countermovement jumps (CMJs) and isometric midthigh pulls (IMTPs) were performed.
  • Peak force and impulse were measured, and fDSI and iDSI were calculated using ratios between CMJ and IMTP data.

Main Results:

  • A moderate positive correlation was found between iDSI and fDSI (ρ = 0.644, p = 0.003).
  • The two indices provided conflicting training recommendations for 37% of the athletes.
  • iDSI demonstrated a stronger association with dynamic performance indicators.

Conclusions:

  • Impulse-based DSI (iDSI) may offer a more valid assessment of an athlete's capacity to apply strength dynamically.
  • Practitioners should consider incorporating impulse-based DSI into training and research for a more comprehensive evaluation.