Kinematics is a branch of sports in physics. With regard to traffic accidents, the theory behind kinematics allows us to understand what happened in traffic accidents and after traffic accidents.

Using the formula E=1/2mV 2 we can prove that speed is the main cause of trauma when a traffic accident occurs. This formula can help us to calculate the kinetic energy of the parties to a traffic accident.

E (kinetic energy in joules) =

1/2 mass (kg) speed 2 (m / s)

If we use this formula to calculate the weight 80 kg, and the kinetic energy of 18 meters per second (about 40 miles per hour / 65 kilometers per hour) speed of the movement generated by the person, we get the following results:

E=1/2 x 80kg x (18m/s)2=12.96KJ

Now we use the same formula, but double the person’s weight to 160 kilograms

E=1/2 x 160kg x (18m/s)2=25.92KJ

In the end we changed the weight to the original 80 kg and now double the speed ( 80 mph / 130 km / h )

E=1/2 x 80kg x (36m/s)2=51.84KJ

We can clearly see that speed is the main factor, not the weight of people. However, more precisely, a rapid slowing or slowing down of speed results in fatal trauma.

Newton's First Law of Motion states that objects in motion will remain in motion, abolishing the force and stopping it.

It is very important to be prepared to understand what is happening in the course of a traffic accident. Let's look at a car speed of 40 miles per hour / 65 kilometers per hour crashed into a tree example.

In this process, 4 different collisions occurred in sequence :

1. The car hits a solid fixed object like a tree

2 , passengers hit the vehicle structure

3. The passenger’s internal organs continue to tear before they continue to move and cause a collision with the abdominal wall.

4. Unrestricted objects in the car continue to move and may hit the driver causing further damage

Understanding this series of events is crucial to understanding internal and external injury patterns.

What can rescue workers do?

Consider the following information will help with the rescue:

1 , the expected impact speed

2. Interference / damage level of passengers in the car

3. What did the vehicle hit? (a tree, a wall, other vehicles)

4. Type of collision (frontal collision, side collision, rear-end collision, overturning, or a combination of the above )

5. Are passengers wearing seat belts?

6. Are passengers withdrawn from the vehicle?

7. Is there a "bulls eye" sign inside the windshield? (Do passengers hit the windshield?)

8. Is the vehicle overturned?

9. Did this traffic accident cause fatal damage to other people in the vehicle?

These are questions that rescuers may have already asked themselves, but it's important to make this information part of the rescue plan. Evaluating kinematics and understanding the damage mechanism can help us to develop a rescue plan that best suits the needs of the injured.

This article belongs to holmatro and edited by China Rescue Equipment Network.