താൾ:CiXIV132a.pdf/319

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VII

1) the greater the fore-side of the moving body,
2) the denser the medium and
3) the greater the velocity of the moving body.

§. 19 9). Elastically. 83-86. Bodies tend to resume their
original form or volume. As it is a displacement of the mole
cules, it may be experienced in consequence of pressure, flexure
(bending), torsion (twisting), and tension (stretching). Limit
of elasticity, beyond which bodies either lose their form or break.
Different degrees of elasticity: some bodies yield at once to any
displacement of their parts (brittle), others accept the new condi
tion caused by tension, pressure or flexure (extensible).

Other applications: Corks used for closing bottles; chil
dren's balls; air-cushions; springs of carriages, watches and
clocks (see 144); the sounding box of the piano, guitar and
violin (253). Liquids possess very little elasticity and gases
only one-sided one (expansibility).

§ 20. 10) Gravlity. 87-94. The force, in virtue of which
a body falls. A body not supported tends to fall towards the
centre of the earth, which is a particular case of the universal
attraction exerted between the heavenly bodies and all bodies
in nature.

A body suspended by a thread is not attracted by the walls
of the house in any perceptible way, why not? But on the other
hand the atoms of perfumes filling a room, we shall experience
the strongest scent near the walls.

§ 21. Gravity acts upon bodies in proportion to their mass
and inversely as the square of their distance. The mass of
the attracting body being M, that of the attracted M1, distance=
D, attraction = A and the corresponding figures for two other
masses: m, m1, d and a, we see

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