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# Electronics/Acceleration due to gravity.

Question
Dear ZZ

en.wikipedia.org/wiki/Acceleration_due_to_gravity

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

This URL gives a good overview of acceleration due to gravity:

http://www.haverford.edu/educ/knight-booklet/accelarator.htm

Earliest experimenters merely dropped an object from a known distance and timed its arrival.

The reason it is 9.8 meters/sec/sec is because of the law of gravity for the earth.  The value of gravitational acceleration on the moon or Mars would be different due to the mass of those celestial objects.

Gravitational pull at the surface of the moon, for example, is only 17% that of the earth.

http://www.todayifoundout.com/index.php/2011/01/the-gravity-of-the-moon-compared

Hope this helps.

Electronics

Volunteer

#### ZZ

##### Expertise

Electronics questions about AC, DC and digital theory.

##### Experience

Graduate electrical engineer with over 40 years in electronic design, manufacturing, project organization and patent review. Experience in fields of industrial and consumer electronics (audio, video, acoustics, etc.)

Organizations
IEEE (Institute of Electrical and Electronics Engineers); Senior Life member AES (Audio Engineering Society), Fellow Life member

Education/Credentials
BSEE University of North Dakota