Propulsion
Propulsion is a term that refers to the action or process of pushing or pulling to drive an object forward. The term is derived from two Latin words: "pro", meaning before or forward; and "pellere", meaning to drive. A propulsion system is a machine that produces thrust to push an object forward. On an airplane, the propulsion system is a group of parts which include the aircraft engine and the propeller. The propulsion system drives the airplane forward and the aerodynamics of the airplane allow it to lift into the air.
Types of Propulsion Systems
There are several types of propulsion systems, including internal combustion engines, jet engines, rocket engines, and electric propulsion systems. Each type of propulsion system has its own advantages and disadvantages, and is used for different types of vehicles and in different environments.
Internal Combustion Engines
Internal combustion engines are the most common type of propulsion system for ground vehicles like cars and trucks. They work by burning fuel in a combustion chamber, and the heat produced pushes a piston, which turns a crankshaft and drives the vehicle forward.
Jet Engines
Jet engines are used for most commercial and military aircraft. They work by sucking in air, compressing it, mixing it with fuel and igniting it. The resulting explosion pushes the aircraft forward.
Rocket Engines
Rocket engines are used for spacecraft. They work by expelling propellant at high speed to push the spacecraft in the opposite direction, according to Newton's third law.
Electric Propulsion Systems
Electric propulsion systems are used in some modern cars and trains. They work by using electricity to drive a motor, which turns the wheels of the vehicle.
See Also
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