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Related Concept Videos

Types of Impact01:30

Types of Impact

1.1K
Impacts can be classified in various forms, primarily under two subgroups: central impact and oblique impact. A central impact occurs when two objects collide head-on, possessing opposite velocities aligned along the line of impact. Conversely, an oblique impact occurs when two objects collide at an angle, resulting in a modification of both direction and velocity.
The coefficient of restitution is a metric for understanding the dynamics of impacts. It quantifies the ratio of relative velocity...
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Impact01:30

Impact

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Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...
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Impact: Problem Solving01:26

Impact: Problem Solving

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In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
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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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Related Experiment Video

Updated: Mar 22, 2026

A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact
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A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact

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Head Impact Measurement Devices.

Richelle M Williams1,2, Margaret Dowling2,3, Kathryn L O'Connor1,2

  • 1School of Kinesiology, University of Michigan, Ann Arbor, Michigan.

Sports Health
|April 10, 2016
PubMed
Summary

Head impact monitoring devices help quantify athlete head impacts in sports. These tools aid in concussion assessment and diagnosis by measuring impact frequency and magnitude.

Keywords:
accelerometersconcussionhead impactsreviewsubconcussive

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Area of Science:

  • Sports Medicine
  • Biomechanics
  • Neurotrauma

Background:

  • Concussive injuries are a significant concern in sports medicine.
  • Impact-monitoring devices are increasingly used to quantify head impacts in contact sports.
  • This review focuses on head accelerometer use across youth, high school, and collegiate levels.

Purpose of the Study:

  • To provide an up-to-date collection of head accelerometer use in sports.
  • To review devices used for quantifying head impacts in athletes.
  • To assess the utility of impact-monitoring devices in sports concussion research.

Main Methods:

  • A comprehensive literature search of PubMed (1980-2015) was conducted using relevant keywords.
  • An additional Google search identified devices lacking formal publications.
  • The study design was a clinical review (Level 4 evidence).

Main Results:

  • Twenty-four distinct products capable of tracking or recording head impacts were identified.
  • Ten of these head impact devices have published research supporting their utility.
  • The review details the application of these technologies at various athletic levels.

Conclusions:

  • Head impact measuring devices are valuable tools for quantifying athlete exposure to impacts.
  • These devices can describe impact magnitude and frequency.
  • They play a crucial role in a multimodal approach to concussion assessment and diagnosis.