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Electrical Engineering/Acceleration due to gravity.


Dear Prof Cleggsan

The value of Acceleration due to gravity is taken as 9.8 m/s square.   How this value is derived and computed and why this number is not any other number viz 6, 8, 12, 15 etc ?.   

Thanks & Regards,
Prashant S Akerkar

Gravity is the attraction of one body to another. For earth it is related to the size of the earth and the size of the falling object.  Since the earth is very large in comparison with very small, relatively, falling objects that falling rate remains quite steady over the surface of the earth.  If you would travel to other celestial bodies, such as the moon, it would have a different G force due to the smaller mass of the moon compared with earth.

The rate of fall or velocity is easily measured for rough estimates and can also be calculated based on known parameters of the earth.

The above walks one through the calculation of earth's G force.

Hope this helps.  

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