In case of front end crash, the Airbags protect the head, neck and chest from slamming into the dash board / steering etc.
There are four Airbags commonly used in cars which are Side Airbags, Front Airbags, Knee Airbags and Inflatable Seat Belts.

Water Body is also called Water Pump.
It pumps the water / coolent from radiator to engine.
If it damaged, it will directly damage the head of the engine.

Shaft transmit power from one part to another.

A single piston in an engine works with a cylinder.
The number of valves depend on the design and configuration of engine.
Some engines have two valves (one for intake and one for exhaust) and some have four valves (two for intake and two for exhaust).
Intake Valves allow the fuel and air mixture in the cylinder.
Exhaust valves exit the gases from cylinder after combustion.

The top two rings are called “Compression Rigs”.
The bottom ring is called “Oil Controlling Ring”.

An axle is a shaft or rod which is connected with a pair of wheel.
Axle rotates the vehicle wheels an supports the weight of vehicle.
Engine applies force to the axle which rotates the wheels and moves the vehicle forward.
There are three types of axles in vehicles which are Front Axle, Rear Axle and Stub Axle.

Governor controls the engine speed or maintain the speed.
When a load is applied on engine, its speed decreased. In this situation, the Governor maintain the engine speed or RPM.
There are two types of Governors i.e. Centrifugal Governor and Inertia Governor.

ABS is a safety braking system.
ABS controls the braking system during driving.
ABS remove or control the brake system in case of brak paddle locking / jamming.
ABC consists of Velocity Sensor (on each tyre), Electronic Control Unit (ECU),
After this ABS technology, safety assurance has been increased.

The firing order in British engines is 1243.
The firing order in Flat engines is 1212.
The firing order in Strait five engines is 12453.
The firing order in Strait six engines is 153624.

Small gears increased torque but reduced speed. Small gears are used to pull the vehicle.
Larger gears decreased torque but increased speed.