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Related Concept Videos

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.
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Free-falling Bodies: Example01:05

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An object falling without any air resistance under the influence of gravitational force is said to be in free-fall. For free-falling bodies, the acceleration due to gravity is constant, irrespective of their mass. Free-fall is experienced not only by objects falling downward, but also by all objects whose motion is influenced by gravitational force alone. The dynamics of free-fall motion can be calculated using kinematic equations of motion, since free-fall acceleration is constant.
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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.
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Types of Impact01:30

Types of Impact

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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.
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Free-falling Bodies: Introduction01:07

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All objects, neglecting air resistance, fall with the same acceleration towards the Earth's center due to the force exerted by the Earth's gravity. This experimentally determined fact is unexpected because we are so accustomed to the effects of air resistance and friction that we expect light objects to fall slower than heavier ones. People believed that a heavier object had a greater acceleration when falling until Galileo Galilei (1564–1642) proved otherwise. We now know this is...
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Related Experiment Video

Updated: Jul 13, 2025

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 method for simulating forward falls and controlling impact velocity.

James Borrelli1, Robert A Creath2, Mark W Rogers3

  • 1Biomedical Engineering, Stevenson University.

Methodsx
|October 13, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed the FALL FIT system to simulate unpredictable forward falls. This device uses a dynamic model to predict impact velocity, improving the study of protective arm reactions and injury prevention.

Keywords:
BiomechanicsFALL simulator For Injury prevention Training and assessmentFall-injuryForward fallsUpper extremity

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Area of Science:

  • Biomechanics
  • Human movement science
  • Injury prevention research

Background:

  • Assessing protective arm reactions in forward falls typically involves dropping participants from a set height.
  • This method lacks realism as actual fall velocity is unpredictable.
  • Existing methods do not accurately simulate the complex dynamics of real-world falls.

Purpose of the Study:

  • To design and model a system for simulating forward falls with controllable, unpredictable impact velocities.
  • To enhance the experimental validity of studying protective responses during falls.
  • To provide a tool for understanding age-related or dysfunction-related changes in protective strategies and for training.

Main Methods:

  • Construction of the FALL simulator For Injury prevention Training and assessment (FALL FIT) system using commercially available materials.
  • Development of a dynamic model for the FALL FIT and counterweight system.
  • Parameter fitting of the dynamic model using nonlinear optimization and experimental data.

Main Results:

  • The fitted dynamic model accurately predicts fall velocity based on participant height, weight, and counterweight load.
  • The FALL FIT system allows for controllable perturbations, enhancing experimental realism.
  • The model was validated using data from three previous studies.

Conclusions:

  • The developed dynamic model and FALL FIT system enable precise prediction and control of impact velocity in simulated forward falls.
  • This system offers a more realistic approach to studying protective arm reactions and injury mechanisms.
  • It serves as a valuable tool for research on aging, dysfunction, and rehabilitation in fall protection.