Isaac Newton developed many
theories of physics. He was and
still is considered to be one of the greatest thinkers of all time. Newton's
laws pertain to different aspects of science that were mysterious at the time. Newton's first law states that every object continues
in its normal state of motion unless compelled by an outside force to move. A force is anything that causes an object to accelerate,
or, more simply, a push or a pull. If an object is at rest, it will stay at rest and if an object is moving it will stay moving at its constant
Newton's second law states that the acceleration of an object
is directly proportional to the force and inversely proportional to the mass
of the object.
This deals with some new issues. Newton brings up some
new philosophies and new scientific methods and definitions. Non-free fall,
for example, is one. Non free fall is when an object falls through the air with no other outside
forces acting on it besides air drag or air friction, which is the force pulling in
the opposite direction to keep the object moving. The friction on an
object is always equal to the force the object is traveling at.
Newton's third law states
that for every action there is an opposite and equal reaction. In
other words, if one hits a nail with a hammer, the nail also hits the hammer
back with the same amount of force. The only difference between the two
forces is that they travel in opposite directions. For example, when
a car drives on the road, not only do the tires push on the road, but the road
also pushes on the tires. This is essentially what makes a car go.
Newton's third law applied greatly to the building of the Wall because the
builders used hammers to pound in the dirt and the stakes. In return, the
dirt and the stakes pounded back on the hammers.
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