define thrust with a practical example .

Thrust is the force acting on a body perpendicular to the surface . The SI unit of thrust is newton(N).

Example:-

Afixed-wing aircraftgenerates forward thrust when air is pushed in the direction opposite to flight. This can be done in several ways including by the spinning blades of apropeller, or a rotatingfanpushing air out from the back of ajet engine, or by ejecting hot gases from arocket engine. The forward thrust is proportional to themassof the airstream multiplied by the difference invelocityof the airstream. Reverse thrust can be generated to aid breaking after landing by reversing the pitch of variable pitch propeller blades, or using athrust reverseron a jet engine.Rotary wing aircraftandthrust vectoringV/STOLaircraft use engine thrust to support the weight of the aircraft, and vector sum of this thrust fore and aft to control forward speed.

Birds normally achieve thrust during flight by flapping their wings.

Amotorboatgenerates thrust (or reverse thrust) when the propellers are turned to accelerate water backwards (or forwards). The resulting thrust pushes the boat in the opposite direction to the sum of themomentumchange in the water flowing through the propeller.

Arocketis propelled forward by a thrust force equal in magnitude, but opposite in direction, to the time-rate of momentum change of the exhaust gas accelerated from the combustion chamber through the rocket engine nozzle. This is theexhaust velocitywith respect to the rocket, times the time-rate at which the mass is expelled, or in mathematical terms:

whereTis the thrust generated (force),is the rate of change of mass with respect to time (mass flow rate of exhaust), andvis the speed of the exhaust gases measured relative to the rocket.

For vertical launch of a rocket the initial thrust atliftoffmust be more than the weight.

Each of the threeSpace ShuttleMain Enginescould produce a thrust of 1.8MN, and each of the Space Shuttle's twoSolid Rocket Boosters14.7 MN, together 29.4 MN. Compare with the mass at lift-off of 2,040,000kg, hence a weight of 20 MN.^{[citation needed]}

By contrast, thesimplified Aid for EVA Rescue(SAFER) has 24 thrusters of 3.56 N each.^{[citation needed]}

In the air-breathing category, the AMT-USA AT-180 jet engine developed forradio-controlled aircraftproduce 90 N (20lbf) of thrust.^[1]The GE90-115B engine fitted on theBoeing 777-300ER, recognized by theGuinness Book of World Recordsas the "World's Most Powerful Commercial Jet Engine," has a thrust of 569kN (127,900lbf).So is it clear to u have a good day and plz give a thumbs up to it.......!!!!!!!!!