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Related Concept Videos

Normal and Tangetial Components: Problem Solving01:24

Normal and Tangetial Components: Problem Solving

Consider a man with a mass of 70 kg seated in a chair connected to a pin support through a member BC. If the man maintains an upright position, the task is to determine the horizontal and vertical reactions of the chair on the man when the member makes a 45° angle with the horizontal. At this moment, the man has a speed of 5 m/s, increasing at a rate of 1 m/s².
Rigid Body Equilibrium Problems - II01:21

Rigid Body Equilibrium Problems - II

A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?
Internal Loadings in Structural Members: Problem Solving01:28

Internal Loadings in Structural Members: Problem Solving

When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
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Constraints and Statical Determinacy01:26

Constraints and Statical Determinacy

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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Related Experiment Video

Updated: Jul 20, 2026

Using a Virtual Reality Walking Simulator to Investigate Pedestrian Behavior
06:38

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Published on: June 9, 2020

Quantifying the relationship between vehicle interior geometry and child restraint systems.

C P Sherwood1, Y Abdelilah, J R Crandall

  • 1Center for Applied Biomechanics, University of Virginia, Charlottesville, Virginia, USA.

Annual Proceedings. Association for the Advancement of Automotive Medicine
|September 14, 2006
PubMed
Summary

Child restraints need adequate space to prevent dangerous contact with vehicle structures during crashes. Rear-facing systems have minimal clearance, increasing risk, while upper tethers are vital for preventing head injuries.

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Area of Science:

  • Automotive safety engineering
  • Pediatric biomechanics

Background:

  • Child passenger safety is paramount, requiring prevention of interactions between children, child restraints, and vehicle structures.
  • Understanding the spatial relationship between child restraints and vehicle interiors is crucial for crash safety analysis.

Purpose of the Study:

  • To quantify the clearance between various child restraint systems and vehicle structures.
  • To assess the risk of contact during frontal crashes based on available space.

Main Methods:

  • Measurements were taken for fifteen current vehicle models.
  • Seven rear-facing and forward-facing child restraint systems were analyzed.

Main Results:

  • Rear-facing child restraints demonstrated very limited clearance, suggesting frequent contact in frontal crashes.
  • Head contact is probable without the use of upper tethers, which are critical for preventing such interactions.

Conclusions:

  • Inadequate clearance for rear-facing child restraints poses a significant risk in frontal collisions.
  • Upper tethers play a critical role in mitigating head impact injuries for child passengers.