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Related Concept Videos

Elastic Collisions: Case Study01:15

Elastic Collisions: Case Study

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Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
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Types of Collisions - II01:19

Types of Collisions - II

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When two or more objects collide with each other, they can stick together to form one single composite object (after collision). The total mass of the object after the collision is the sum of the masses of the original objects, and it moves with a velocity dictated by the conservation of momentum. Although the system's total momentum remains constant, the kinetic energy decreases, and thus such a collision is an inelastic collision. Most of the collisions between objects in daily life are...
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Collisions in Multiple Dimensions: Problem Solving01:06

Collisions in Multiple Dimensions: Problem Solving

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In multiple dimensions, the conservation of momentum applies in each direction independently. Hence, to solve collisions in multiple dimensions, we should write down the momentum conservation in each direction separately. To help understand collisions in multiple dimensions, consider an example.
A small car of mass 1,200 kg traveling east at 60 km/h collides at an intersection with a truck of mass 3,000 kg traveling due north at 40 km/h. The two vehicles are locked together. What is the...
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Collisions in Multiple Dimensions: Introduction01:05

Collisions in Multiple Dimensions: Introduction

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It is far more common for collisions to occur in two dimensions; that is, the initial velocity vectors are neither parallel nor antiparallel to each other. Let's see what complications arise from this. The first idea is that momentum is a vector. Like all vectors, it can be expressed as a sum of perpendicular components (usually, though not always, an x-component and a y-component, and a z-component if necessary). Thus, when the statement of conservation of momentum is written for a...
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Types Of Collisions - I01:04

Types Of Collisions - I

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When two objects come in direct contact with each other, it is called a collision. During a collision, two or more objects exert forces on each other in a relatively short amount of time. A collision can be categorized as either an elastic or inelastic collision. If two or more objects approach each other, collide and then bounce off, moving away from each other with the same relative speed at which they approached each other, the total kinetic energy of the system is said to be conserved. This...
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Elastic Collisions: Introduction01:00

Elastic Collisions: Introduction

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An elastic collision is one that conserves both internal kinetic energy and momentum. Internal kinetic energy is the sum of the kinetic energies of the objects in a system. Truly elastic collisions can only be achieved with subatomic particles, such as electrons striking nuclei. Macroscopic collisions can be very nearly, but not quite, elastic, as some kinetic energy is always converted into other forms of energy such as heat transfer due to friction and sound. An example of a nearly...
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How do drivers avoid collisions? A driving simulator-based study.

Xiaomeng Li1, Andry Rakotonirainy2, Xuedong Yan3

  • 1MOT Key Laboratory of Transport Industry of Big Data Application Technologies for Comprehensive Transport, School of Traffic and Transportation, Beijing Jiaotong University, Beijing 100044, China; Centre for Accident Research and Road Safety-Queensland (CARRS-Q), Institute of Health and Biomedical Innovation (IHBI), Queensland University of Technology (QUT), Kelvin Grove, Qld 4059, Australia.

Journal of Safety Research
|December 19, 2019
PubMed
Summary
This summary is machine-generated.

Drivers often brake or brake and swerve to avoid collisions, but intuitive reactions like swerving towards hazards can increase risk. Understanding these behaviors is key for developing better collision avoidance systems.

Keywords:
Collision avoidance behaviorCollision with pedestrianDriving simulatorHead-on collisionRight-angle collision

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Area of Science:

  • Traffic Safety Research
  • Human Factors Engineering
  • Automotive Engineering

Background:

  • Collision avoidance performance is critical for road safety outcomes.
  • Understanding driver behavior in critical scenarios is essential for improving vehicle safety systems.

Purpose of the Study:

  • To investigate driver collision avoidance performance in right-angle, head-on, and pedestrian collision scenarios.
  • To identify key factors influencing collision likelihood and the effectiveness of avoidance maneuvers.

Main Methods:

  • Utilized a high-fidelity driving simulator with 45 participants.
  • Recorded drivers' longitudinal/lateral collision avoidance actions and collision outcomes across three distinct scenarios.

Main Results:

  • Braking was the most frequent response; braking combined with swerving occurred in head-on and pedestrian scenarios.
  • Swerve-toward-conflict was common and linked to higher risk, showing faster swerve reaction times but potentially delaying braking.
  • In right-angle collisions, drivers compensated for longer time-to-collision (TTC) with higher deceleration rates rather than swerving.

Conclusions:

  • Long brake reaction times and incorrect swerve directions significantly increase collision risk.
  • Intuitive decision-making, like swerving towards a hazard, can impair braking and lead to negative outcomes.
  • Findings inform the design of advanced collision avoidance systems and active steering assistance for semi-automated vehicles.