Physics drops: Why it is more dangerous to fall from the third, and not from the fourth floor

17 Сен

Physics drops: Why it is more dangerous to fall from the third, and not from the fourth floor

The trajectory of the falling person, the length of the flight and the landing place depends on the set of conditions. Jewelsecperts in character injury can determine the circumstances of the fall. Information on how the human body behaves in flight can help not only reveal the crime, but also reduce the severity of injuries.

In the first case, a person gives an acceleration of some extraneous force (for example, it was pushed) or he himself (making a jump or pushing out of the windowsill).


And in that, in another case, during the flight process, the body can change the position, as well as deviate from the perpendicular, connecting the point, from which the fall began, and the landing place. This is due to the mutual movement of body parts having a different mass and volume, as well as due to the rotation of the body around the center of gravity or point of collision with obstacles.

The initial push does not always increase the departure distance. The closer to the center of gravity (it is located in the navel area) is attached accelerating force, the further body departs from the perpendicular. Conversely: the blow is much higher or below the center of gravity is usually accompanied by the movement down in a straight line, and the body lands at the intersection point of the perpendicular of the fall with the plane of the collision or even in front of it (if the starting point was the protruding part of the building).

The researchers found out that in the fall, the mannequin rotates around the center of gravity in the frontal plane. The number of revolutions depends on the height. Falling with seven-eight meters (third floor), it turns 180 ° and hits the ground head; Flying from the height of ten-eleven meters (the fourth floor) leads to a turnover of 270 °, after which the person lands on the back.

Moreover, the mass itself does not affect the speed. Different speeds of falling bodies with different mass is associated with air resistance, which, of course, will be greater for a stick than for weights. If the human body is alone, then the rapidness of his movement will depend on the height and acceleration of the free fall. The last value depends on the level on which the object is originally located, but it is so insignificant that this change is usually neglected. Practically the flight speed is determined by the height.

The high speed is obtained when falling from a fast moving item. When we fall from a bike or jump out of the car, our body gets the speed of this means of movement and seeks to move forward.

Physics says it is more correct to jump back to reduce the speed acquired from the moving subject. But in any case, there is a threat to fall, since the upper part of the body will still move when the legs are already stopped by touching the earth. Therefore, falling in the direction of the train stroke safer than back, — in this case, a person puts his legs forward (or runs up a few steps), warning drop.

In addition, jumping forward, a person arises in front of him and weakens the blow strength. However, if you want to throw a luggage from the train, it is better to do this against the train movement.

Since the tissues of the body are elastic, have different elasticity and resistance, and some parts of the body can move, it significantly reduces the force of impact. But, of course, it can be loosen due to the elastic flexion of the limbs and the simultaneous landing by several points.