This post follows on from this earlier one which introduced Newton’s Universal Law of Gravitation.
The gravitational field strength (vector) g is defined as the gravitational force at a given point divided by the mass of an object at that point so g=F/m
On earth g = 9.81Nkg-1 (acc due to gravity). Slightly variable, equatorial r >polar r, thus g greater at the poles, neglecting the spin of the earth which will tend to reduce effective value.
g = constant near the Earth’s surface, falls as as we move away.
Gravitational field lines (parallel) are perpendicular to equipotential surfaces (zero change in GPE when moving around on them, i.e, the field is conservative. The same work…
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