The common normal area to the surfaces in contact during the impact is called the line of impact as shown. Here, the mass centres of the two colliding bodies are located along the line of impact. Impact of this type is called central impact. In such a case, the impact shall be called as direct central impact.

I) Direct impact: When two bodies, moving along the same line, collide the impact is called direct impact. III) Line of impact: The instant when two bodies just collide, the line joining their centres is called the line of impact.

The line of impact is the line that is collinear to the common normal of the surfaces that are closest or in contact during impact. This is the line along which internal force of collision acts during impact, and Newton’s coefficient of restitution is defined only along this line.

In the last section we discussed impacts that took place when the two particles in question were moving along the same straight line. Such an impact is called direct central impact, and in this case the problem can be completely solved by considering it in a one-dimensional setting.

The NTSB has concluded, based on evidence at hand, this was a “high-energy impact crash,” meaning the helicopter was travelling quite fast when it slammed into the hillside and exploded. The helicopter also wasn’t equipped with TAWS or terrain alertness and warning system similar to that on passenger planes.

If it’s a high-speed car crash, the ribs can also break from the impact. Since the ribs protect the lungs, the chances of a lung collapsing increases drastically. In addition, the heart is propelled forward with the rest of your torso and can hit the hall of the chest and ribs, bruising the heart.

When there is an explosion that tears a big hole into the plane and the cabin’s little bubble of pressure is suddenly burst, something called “explosive decompression” takes place. Basically, the pressure difference comes rushing at your body so fast that it tears your body apart.