Rocket Launches

A ball that is thrown up in the air falls down due toincrementally. It is not known however if the
gravity. But can you throw a ball up in space so thatgravitational force becomes zero continuosly or just
it escapes the gravitational pull of the earth's surface.becomes zero abruptly when the object encounters
Yes, precisely, that is how rocket launches work asspace. Rockets are known to suddenly burn when
well.they enter the earths gravity from space due to the
When a ball is thrown up manually it reaches a heighthuge force that is exerted by the earth.
of 1 metre in say 10 seconds. So the velocity isContrary to popular understanding space does not
roughly 0.1 m/s. The kinetic energy produced due tohave a vertical or horizontal direction. The force is
the motion of the ball is not sufficient to make thecontinuous. The escape velocity is different for each
ball escape the gravitational force exerted by theplanet. A zero gravity scenario is mimicked by making
Earths surface on the ball.a lift fall from the top of the empire state building.
But if the ball has sufficient energy to overcome theDue to Newtons third law of motion any object will
gravitational pull of the Earth on the ball, then it wouldexperience 0 gravity during a free fall.
escape gravity and start orbiting the Earth. TheCommercial launches have different issues to consider
velocity required to make an object escape thesuch as flight safety, crew safety, fuel for rockets
earths gravitational force is independent of the massetc., The applications that orbiting satellites have
of the object and is about 11.3 Km/Sec.provided are enormous. The current GPS technology
Rockets are launched using a similar principle. Eitherused in many Earth stations is primarily based on
the energy can be supplied initially or can be suppliedcommunication provided by revolving satellites.