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# Physics of a Car Crash

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## Stephanie Boston

on 13 November 2012

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#### Transcript of Physics of a Car Crash

Types of Car Crashes An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Physics of a Car Crash By: Stephanie Boston and Liliette Diavua Injuries due to car crash force Newtons Law Works Cited http://www.ehow.com/about_5426906_different-types-car-accidents.html 1: Law of Inertia
Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). 2: According to the second law... For every action there is an equal and opposite re-action. 3 http://teachertech.rice.edu/Participants/louviere/Newton/ a car will remain in motion unless an external force by means of a brake is applied on it. In case of a car accident, the force with which the car crashes into the tree would result in the tree exerting the same amount of force on the bonnet, and damage it. The directions of the forces are opposite. To illustrate, a car will remain in motion unless an external force by means of a brake is applied on it. http://www.car-nection.com/carfun/car-physics-understanding-newtons-laws-of-physics.html Inelastic collision
Physics

A collision between bodies in which the total kinetic energy of the bodies is not conserved. In an inelastic collision, the total momentum of the two bodies remains the same, but some of the initial kinetic energy is transformed into heat energy internal to the bodies, used up in deforming the bodies, or radiated away in some other fashion. Inelastic collisions, such as the collision of two balls of clay, tend to result in the slowing and sometimes the joining together of the colliding bodies. Elastic collision
Physics
A collision between bodies in which the total kinetic energy of the bodies is conserved. In a perfectly elastic collision, no energy is dissipated as heat energy internal to the bodies, and none is spent on permanently deforming the bodies or radiated away in some other fashion. Elastic collisions, such as the collision of a rubber ball on a hard surface, result in the reflection or "bouncing" of bodies away from each other. - Multiple superficial injuries were found most common in the lower limbs and face.
- Injuries to the chest, pelvis and upper limb were seen in equal proportions of victims,
- Other sites of injuries were the back, spine, and neck.
Most of these injuries are a result of not wearing a seatbelt, lack of airbags and presence of sharp objects on the car during or after collision. Internal injuries could also be sustained, if sharp objects pierce organs inside the person’s body or if organs are thrown about too violently, especially for pregnant women.

Cars are designed with crumple zones so they may slow down over a longer period of time, which keeps the force smaller. However, this safety feature alone will usually not prevent serious injury or death to the occupants of a car during an accident. The crumple zone only slows the car more gradually. The only way it slows the occupants more gradually is if they are attached to the car. Otherwise, the car may come to rest more slowly but the people come to rest immediately upon striking the already stopped interior of the car. Stopping in a small amount of time means the force must be very large. What is the car desighned to do?
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