Crash detection feature of Apple phones

Crash Detection feature makes the phone detect when the user has a fall and makes a call to emergency assistance service.
The feature is also designed to share important information like location of the user with assistance services.
Reports have emerged in the U.S of the new iPhones calling emergency assistance services when users are on a rollercoaster ride.

The crash detection feature makes use of the dual-core accelerometers, the dynamic range gyroscope, barometer, GPS and microphone. These provide critical information used to detect ambient changes.
Data from these sensors then runs through its motion algorithms to determine whether the device has been in a crash or not
The information collected includes G-force measurements, changes in cabin pressure, sudden changes in speed and detection of loud noises.
According to Apple, this information is used by its motion algorithms to determine whether the device has been in a crash or not.

What is a G-force?

A g-force is a measure of acceleration.
1G is the acceleration we feel due to the force of gravity. It’s what keeps our feet firmly planted on the ground.
Gravity is measured in metres per second squared, or m/s2. On Earth, the acceleration of gravity generally has a value of 9.8 m/s2

What is an accelerometer ?

An accelerometer is a device that measures the vibration, or acceleration of motion of a structure.
It can detect motion to help a device, such as your phone, determine when you’re working out, how many steps you’ve taken, and whether you’re holding it in landscape or portrait mode

What is a gyroscope ?

A gyroscope is a device with a spinning disc or wheel mechanism that harnesses the principle of conservation of angular momentum: the tendency for the spin of a system to remain constant unless subjected to external torque.
A gyroscope senses change in orientation of a device, and when paired with an accelerometer, is an excellent tool for measuring the orientation of an object in 3D space.

What is a barometer?

A barometer is a scientific instrument that is used to measure air pressure(atmospheric pressure/barometric pressure) in a certain environment.
The atmosphere is the layers of air wrapped around the Earth. That air has a weight and presses against everything it touches as gravity pulls it to Earth. Barometers measure this pressure.
On a barometer, low air pressure will cause the fluid inside to rise higher in the tube. The higher it goes, the more likely it is you’ll end up with a rainy day, since there’s more air rising and condensing into clouds.

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