SIR ISAAC NEWTON FACTS:
Isaac Newton was born in 1642 in a manor house in
Lincolnshire, England. His father had died two months before
his birth. When Isaac was three his mother remarried, and
Isaac remained with his grandmother. He was not interested in
the family farm, so he was sent to Cambridge University to
study. Isaac was born just a short time after the death of
Galileo, one of the greatest scientists of all time. Galileo had
proved that the planets revolve around the sun, not the earth
as people thought at the time. Isaac Newton was very
interested in the discoveries of Galileo and others. Isaac
thought the universe worked like a machine and that a few
simple laws governed it. Like Galileo, he realized that
mathematics was the way to explain and prove those laws.
Isaac Newton was one of the world’s great scientists because
he took his ideas, and the ideas of earlier scientists, and
combined them into a unified picture of how the universe
According to Newton's first law...
An object at rest will remain at rest
unless acted on by an unbalanced
force. An object in motion continues in
motion with the same speed and in the
same direction unless acted upon by
an unbalanced force.
This means that there is a natural
tendency of objects to keep on doing
what they're doing. All objects resist
changes in their state of motion. In the
absence of an unbalanced force, an
object in motion will maintain this state
Acceleration is produced when a force
acts on a mass. The greater the mass
(of the object being accelerated) the
greater the amount of force needed (to
accelerate the object).
Everyone unconsciously knows the
Second Law. Everyone knows that
heavier objects require more force to
move the same distance as lighter
For every action, there is an equal and
This means that for every force there is
a reaction force that is equal in size,
but opposite in direction. That is to say
that whenever an object pushes
another object it gets pushed back in
the opposite direction equally hard.
The rocket's action is to push down on the
ground with the force of its powerful engines,
and the reaction is that the ground pushes the
rocket upwards with an equal force.
Newton's laws of motion are three physical laws that form the basis for
classical mechanics. They describe the relationship between the forces
acting on a body and its motion due to those forces. They have been
expressed in several different ways over nearly three centuries, and can
be summarized as follows:
First law: The velocity of a body remains constant unless the body is
acted upon by an external force.
Second law: The acceleration a of a body is parallel and directly
proportional to the net force F and inversely proportional to the mass m,
i.e., F = ma.
Third law: The mutual forces of action and reaction between two bodies
are equal, opposite and collinear.
The three laws of motion were first compiled by Sir Isaac Newton in his
work Philosophiæ Naturalis Principia Mathematica, first published on July
5, 1687. Newton used them to explain and investigate the motion of many
physical objects and systems. For example, in the third volume of the
text, Newton showed that these laws of motion, combined with his law of
universal gravitation, explained Kepler's laws of planetary motion