Galileo Galilee introduce the idea of inertia which is close to Newton's momentum

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GALILEO GALILEE’S INERTIA
CM [007]

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Galileo Galilei
Galileo Galilei (1564-1642) was an Italian
physicist, mathematician, engineer,
astronomer, and philosopher who played a
major role in the scientific revolution during
the Renaissance.
His achievements include improvements to
the telescope so much so that data could be
collected to support Copernicanism. Galileo
has been variously called the “father of
modern observational astronomy”, the "father
of modern physics”, the “father of science”,
and “the father of modern science”. When
Newton said that he could see further because
he was on the shoulder of giants.” Galileo is no
doubt the giant he referred to.

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Inertia
One of Galileo’s important contributions to the idea of motion is the discovery of
inertia. The word ‘inertia’ comes from the Latin word, iners, which means idle,
sluggish. It describes the quality of an object to resist changes to its state of
motion. If you want to move an object, you feel its resistance and you need an
effort to change it.
Inertia is the tendency of
matter to resist changes in its
velocity. Inertia look slightly
different from impetus.
Inertia is an intrinsic property
of matter. It is that property
of matter which opposes
changes in velocity.
Inertia Force

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Experiment to Prove
Inertia
The proof of this idea was
that if a ball rolled down
one ramp, its inertia
would cause it to roll up
an opposite ramp of
equal height. If the
ramps are placed close to
each other, the motion
will go on for some time
before being stopped by
the effects of friction.

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If we lower the slope of the second ramp, the ball will actually travel farther up the
ramp, but to the same height. Using this logic, as the ramp approaches a level
surface, the ball will roll forever.
Conservation of Inertia
The theory of inertia says that an object’s inertia has the
tendency to maintain its state of motion. The more inertia
an object has, the harder it is to change its state of motion.

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Galilean Law of Inertia
Inertia is also something innate with a moving object. Galileo's Principle
of Inertia stated: “A body moving on a level surface will continue in the
same direction at constant speed unless disturbed.”
This principle was later incorporated into Newton's laws of motion (first
law).

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The Law of Inertia
In popular culture we often see this Law written as:
An object at rest will tend to remain at rest unless acted upon by an outside
force. An object in a constant state of motion will tend to remain in that state of
motion unless acted upon by an outside force.

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The Kinetic Piece
Thus Galileo succeeded in
adding another piece of our
motion puzzle.
Inertia
VelocityForce Impetus

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NEWTON’S PRINCIPIA
To be continued on: CM [008]
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