During a crash, as many as ___________ collisions can occur

Topic: During a crash, as many as ___________ collisions can occur

A. 3

B. 5

C. 10

D. None

The answer is A: 3 There can be three types of collisions during a crash. The explanation for this answer is given below.

During a crash, as many as three collisions can occur. Generally, collisions occur when one object crashes into another object. There are different types of collision are there. For example car collision, traffic collision etc.

The most important collision is the human collision. The human collision is the effect endured between a vehicle tenant and the vehicle he or she is riding in amid some sort of security occurrence.

What is a collision?

A motor vehicle or traffic collision is when a vehicle collides with another pedestrian, vehicle, animal, stationary object or debris. A traffic collision can result in damage, injury or death.

Several factors are the causes of a collision. Speed, vehicle design, road design, driver skill, road environment, speeding and distracted driving.

Types of collisions

In any collision, there are two or three types of collision that take place at any time. Read on to understand them and take preventive measures if required.

The first collision

This is the vehicular collision – when a car collides with another object. These are associated most commonly with car crashes. Most vehicles are designed in a way that crushes well and absorbs the kinetic energy involved in a crash.

This keeps the human occupants of the car safe. So, if you know there is an oncoming collision, it is better to turn to a stationary object like a bush, so it can absorb the energy and keep the passengers safe. However, crashing into a tree, pole or vehicle will lead to injury.

The second collision

When a crash occurs, the human occupants of a vehicle are still moving at speed the vehicle was travelling in before the moment of impact. These occupants will stop only if they connect with another force or if they hit something. This is known as the human collision.

The car’s kinetic energy is absorbed in the first collision, but the passengers or occupants are still moving at the same speed as the car, before the impact, unless they hit something that stops their momentum.

This is the same as an event when a car stops suddenly, and you end up bumping your head against the front seat. This is where seatbelts are important.

In case seatbelts aren’t used, the occupants will move forward till they hit the steering wheel, window or dashboard. The seatbelt restrains the passengers and prevents injuries. In the absence of a seatbelt, the occupants could be also be ejected from the car and crash into a concrete barrier or tree which would stop their motion immediately.

Because of the kinetic energy in the movement, the body might get crushed.  An unbuckled passenger has a higher risk of death in a car crash.

The third collision

The internal organs of the occupant move toward the impact point and collide with other organs or bones. The body may look uninjured, but there may be internal bleeding or bruises inside the organs.

This is the 3rd type – the internal collision. The occupant’s body stops moving while the organs move until other body parts or organs exert enough energy to stop them. A car crash with a high deceleration force, like a car crashing into concrete often leads to ruptured liver, spleen or large vessels.

Why do three types of collisions happen?

Every crash has three types of collision because of the application of Newton’s first law of motion. This states that a body will remain at rest unless a force makes it move or will move unless a force stops it.

Force is needed to change the direction and/or speed of a moving body. The law basically means that it will take force or energy to stop or start a body in motion.

What happens in the 10 seconds after Collision?

The 1st tenth of a second

The vehicle and occupants inside are going at the speed of the car. If the car strikes a tree the front part slows down to 0 km/hr or 0 miles per hour, the bumper deforms, while the remaining car and occupants keep going at the original speed before the crash, say 40 mph.

2nd tenth

The bumper will continue to deform as the kinetic energy of the crash dissipates. The fan and radiator crush. The frame and engine strike the tree and start decelerating.

3rd tenth

The body and frame of the car continue to deform, while the front dash, passenger compartment and windshield decelerate to a lower speed. The occupants are still moving at speed before the crash – 40 mph.

4th tenth

The frame will decelerate and dissipate energy. The occupants and safety belts move at the original speed before the crash at 40 mph.

5th tenth

The safety belts stretch and decelerate the passenger. Unbelted passengers and loose objects in the back seat will continue to move at the original speed of the car before the accident, that is 40 mph.

6th tenth

Safety belts have stretched to their limit and belted passengers decelerate while the dash and windshield decelerate to 0 mph. The vehicle’s frame, engine and body continue to absorb the energy.

Unbelted passengers continue to move forward at the speed of 40 mph, toward the steering wheel, windshield and dashboard. Unsecured objects could strike occupants to cause injury or death.

7th tenth

The body and frame have deformed and rebounded. The occupants with seat belts rebound from the safety belts, and the head comes in contact with head restraints.

Unbelted passengers hit windshields, dashboard or steering wheels to decelerate to 0 mph and the internal organs strike the decelerating body frames.


Car collisions can be extremely dangerous to the vehicle, occupants and other cars around. Seatbelts save lives and must be worn to be safe in collisions. Sometimes the external body may appear uninjured but may have suffered internally.


  1. Three types of collision in a crash: Taken from emergencymedicalparamedic.com
  2. Vehicle collisions and the impact: Taken from stateauto.com
  3. Human collision and vehicular collision: Taken from toocooltrafficschool.com


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