Yes.
Yes
significant impact to the head & rapid acceleration/deceleration of the headBOTH A and C
Significant impact to the head and rapid acceleration/deceleration of the head
Significant impact to the head AND Rapid acceleration/deceleration of the head
- Significant impact to the head - Rapid acelleration/deceleration of the head
Types of incidents that can cause Traumatic Brain Injury TBI can include:Shaking a young baby or child - "Shaken Baby Syndrome" - often fatal in babiesViolent shaking of an adult, especially if the person has little control over their head / neck, example: disabled personSlip and fall when the head strikes a hard surface and rapidly goes from moving to impact.Traffic Accidents, even at slow speedsBeing struck on the face or chin with a closed fist. Example: Domestic violence. In fist-fights and brawls-- "One punch kill" refers to fights when one person only threw one punch and kills the victim.Sports injury, especially in football, soccer, basketballWartime head injuries
Mass and rate of deceleration.
It is not dependent on speed alone. It is mostly based off of acceleration or deceleration rate. You could be parked and hit by a large truck and the airbags could go off.
The airbag reduces the deceleration experienced on impact. In terms of acceleration, this means that the airbag has lowered the rate at which the downward acceleration decreases.If a falling person hits solid ground then their velocity goes from high to zero almost instantaneously. This means that the downward acceleration has changed very quickly. The airbag increases the time in which it takes the velocity to fall to zero. This is the same as saying it reduces the deceleration.Of course an airbag has the additional benefit of being soft relative to the ground, but simply considering acceleration/deceleration, reducing this lessens the harm done to the person. A high rate of acceleration/deceleration by itself can cause death/serious injury as a person's internal organs rupture due to the sudden collision with the other parts of the body (bones for instance). An airbag is helping by reducing the rate of change of the downward acceleration to a more survivable level. The force on the person is therefore lowered on "landing".
It is not really the speed it is the rate of deceleration.
If you crashed your 4WD into a tree without seat belts on and drove away, yes, you should be worried about your mental well being. The above example is a scenario in which Tramatic Brain Injury is caused. Damage to the brain resulting from external mechanical force, such as rapid acceleration or deceleration, or impact can cause "shearing" of the brain tissue. The initial injury can present as a mild concussion to a more disabling traumatic brain injury. This injury may not present until hours or days after the incident, so being "worried" or seeking medical help is appropriate. TBI is usually the name given to the brain injury which is sustained *not* from penetration of the skull or brain, but from the rapid acceleration, deceleration or impact, such as in Shaken Baby Syndrome, another cause of TBI, which can be fatal. August 9, 2009 related link: http://www.wikipedia.org/wiki/traumatic_brain_injury
In the 1920 it was automobile significant impact
What is the mass of the meteorite if its impact speed is 10m/s so that it has an acceleration of approximately -1000000000