Physics+Concepts+behind+Car+collisions

=**__Physics of Collisions involving 2 bodies:__**=

1. A body at rest will remain at rest and a body in motion will remain in motion until acted upon by an unbalanced force – This can be used to explain why a car crumples up upon impact, since the front of the car may have been stopped by the body it has crashed into, the back part of the car is still moving forward as it is not acted upon by an unbalanced force, causing the car to crumple up.
 * __One can apply the 3 laws of Newton:__**

2. Force = Mass x Acceleration – This can be used to account for the fear of colliding with heavy vehicles (i.e. trucks, buses etc.) and driving at high speeds, as an increase in either mass or acceleration would result in a greater force, causing greater damage and disaster. This law also goes to show the devastation of head-on collisions, as the accelerations of both vehicles are added, leading to a very forceful impact.

http://dsc.discovery.com/videos/mythbusters-100-mph-crash.html - Don’t Drive Too Fast http://dsc.discovery.com/videos/mythbusters-crash-force-highspeed-2.html - Head-On Collision Slow-Motion 3. For every action there is an equal and opposite reaction – The big reasoning for car crashes, because the victim crashed.

Physics of Collisions involving Rollovers: 1) Based on the laws of gravity, vehicles that transport heavy-loads (i.e. trucks, SUVS etc.) are more likely to experience rollover accidents due to the higher ground clearance for driving and the absence of balancing the weight across the vehicle


 * __One can apply the Law of Momentum Conservation:__**

Momentum: An impelling force or strength

Definition of Law of momentum conservation:"For a collision occurring between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision. That is, the momentum lost by object 1 is equal to the momentum gained by object 2."

In simpler terms, it means that the total force of two colliding objects would remain the same before and after the collision, the force loss by object 1 would be the force gained by object 2 and vice versa.

=__For Prevention Devices, Physics is also applied:__=
 * __The Laws of Reflection is applied:__**

1) The angle of incidence is equal to the angle of reflection.

2) The incidence, reflected and normal all lie on the same plane.



-applicable here: -Dry friction resists relative lateral motion of two solid surfaces in contact. Dry friction is subdivided into //static friction// between non-moving surfaces, and //kinetic friction// between moving surfaces.
 * __Friction__**
 * -**is the force resisting the relative motion of solid surfaces, fluid layers, or material elements sliding against each other. It may be thought of as the opposite of "slipperiness".