Launching a satellite:

To enable a satellite to orbit around any of the planet, we have to consider the height from which the satellite should be thrown.

Consider yourself; if you throw a stone, it comes to earth back after some time, why? It is due to the gravitational attraction of earth and the stone. By Newton's law of gravitation, stone and earth would be attracted towards each other by the force

F = GMm / R²

Here M-is mass of earth

m-is mass of stone

R-is distance among centre of earth and stone

The force exerted on the earth by stone is quite small to attract or move the earth towards the stone thus; only the stone gets attracted towards earth. Earth moves but as mass is very small to attract or move earth towards the stone therefore, only the stone gets attracted towards the earth. The Newton's law of gravitation can be given by

F ∝ 1/ R²

That is greater is the distance, lesser the force of attraction. As value of g decreases with increase in the height and expression can be given by

g_h / g = g (1 - 2h / R )

We can say that to put on object into the earth's orbit.

Move object to appropriate height.

Then, project it with the high velocity. Assume that you could climb an imaginary mountain whose summit pokes above Earth's atmosphere. If you threw a baseball from the top of mountain, it would fall on the ground in a curving path. 2 motions act on it: trying to go in a straight line and falling down toward Earth. The faster you throw ball, the farther it will go before it hits ground.

    If you could throw ball at a speed of 17,000 mph, it would never come back on the ground. It would circle the Earth in the curved path, otherwise called as orbit. This is the speed required to put satellites into orbit, this is why the Space Shuttle and the other satellites have such powerful boosters. You can't approach that speed, but you can begin to see how increasing force influences the distance traveled.