Encyclopædia Britannica, Ninth Edition/Gravitation

GRAVITATION

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Sections

I. Gravitation at the Surface of the Earth.

Attraction • Movement of a Falling Body • Values of g • Algebraical Formulæ • Motion of a Projectile

II. The Centre of Gravity.

Centre of Gravity of a Plate • Centre of Gravity of a Rigid Body • Gravitation of a Rigid Body reduced to One Force

III. Universal Gravitation.

Law of Gravitation between Two Masses • Motion of a Planet round the Sun • On the Elliptic Motion of the Planets • The Hodograph • The Problem of Three Bodies • Calculation of Disturbed Motion • Determination of the Forces • Deductions from these Expressions • The Motion of the Moon • The Variation

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