Gravitational field strength on Earth

December 26, 2016

Of the gravitational field

A field is something that has a magnitude and a direction at every point in space. Gravity is a good example - we know there is an acceleration due to gravity of about 9.8 m/s2 down at every point in the room. Another way of saying this is that the magnitude of the Earth's gravitational field is 9.8 m/s2 down at all points in this room.

Gravitational field: = /m

where F is the force of gravity.

We can draw a field-line pattern to reflect that, near the Earth's surface, the field is uniform. The strength of a field is reflected by the density of field lines - a uniform field has equally-spaced field lines.

If we zoom out and view the Earth from far away, we get a non-uniform pattern. In fact, the pattern is radial - the lines are further apart as they get further from the Earth, reflecting the fact that g decreases with distance. At every point, though, the field-line pattern shows the direction of the gravitational force that would be experienced by a mass placed at that point.

091 Gravitational field strength
091 Gravitational field strength
Gravitational Field
Gravitational Field
2.3 Gravitational Field Strength
2.3 Gravitational Field Strength

Can anyone explain me the derivation of the formula for GRAVITATIONAL FIELD STRENGTH? That is g=GM/r^2? | Yahoo Answers

Not quite sure what you are looking for here.
Newton postulated that the gravitational force (F) between two masses M and m was proportional to the product of their masses and inversely proportional to the square of the distance between their centres of mass (r). Hence:
F [is proportional to] Mm/r²
The next obvious step is to introduce a constant of proportionality G which was determined experimentally, giving us:
F = GMm/r²
When one of the masses (M) is a planet, and m is a relatively small object, we have a special name for the gravitational force between them. We call it the wei…

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