Help with minor car crash physics

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SUMMARY

This discussion focuses on the physics of a minor car crash involving two vehicles traveling at 5 mph. Key concepts include the conservation of momentum and kinetic energy, with considerations for elastic versus inelastic collisions. Participants suggest calculating the differences in outcomes for both types of collisions and factoring in elements such as friction and rotational kinetic energy. The conversation emphasizes the importance of understanding these physical principles to analyze real-life accident scenarios effectively.

PREREQUISITES
  • Basic understanding of Newton's laws of motion
  • Familiarity with concepts of momentum and kinetic energy
  • Knowledge of elastic and inelastic collisions
  • Understanding of friction and its effects on motion
NEXT STEPS
  • Study the principles of momentum conservation in collisions
  • Learn how to calculate kinetic energy for moving objects
  • Research the differences between elastic and inelastic collisions
  • Examine the role of friction in car accidents and its impact on collision outcomes
USEFUL FOR

Physics students, automotive engineers, accident reconstruction specialists, and anyone interested in understanding the dynamics of car collisions.

noobie_physics
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Hello,

I am new to forums so please excuse my post if it is in the wrong area.

I was wondering whether someone could help me out with understanding the physics involved in a minor car crash between 2 cars (both traveling at 5 mph).
*This is not homework etc, trying to understand a real life accident.

I have started to read up on some areas e.g. Mass of cars, Velocity and Kinetic Energy but need help sticking it all together - unless someone is willing to show me the calculations involved and work it out?(should be able to provide details required).

TIA for any information or pointers.

Kind Regards,
Rhys.
 
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To simplify, consider if it is elastic or inellastic. At 5 mph, it is probably pretty elastic. So, momentum and kinetic energy will be conserved to a high degree (this is just an assumption). You could also take a different approach and consider a different question to answer: how elastic/inelastic is the collision. Then, you could make a calculation for the results of an elastic and an inelastic collision, and compare to the actual results of the collision. You also should probably consider the friction between the cars and the road, and rotational kinetic energy I think should be included as a deviation from perfectly elastic behavior.
 

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