Newtons laws of motion:
Newton gave us the basic formulation to
study the motion of and object and then to predict the next position. Today
also we use the same formulae to study the motion effectively. But sometimes we
need to use Einstein's modification which call the relativity equations.
Sir Isaac Newton was the best
physicist that the world has ever got. He has done the work in almost all the
parts of the physics. He found that the mathematics is incomplete and cannot be
used satisfactorily in the physics and for other applications. So, he
introduced new branch of the mathematics called Calculus. but he is well known
for his laws of motion. His formulation is so important that he is said to be
the father of the physics.
First law of
motion: (Also called
as law of inertia)
An object
continues to be in the state of rest or uniform motion in straight line unless
acted upon by external unbalanced force.
This is simplest explanation of all bodies in the universe and
true for all of them including the human body. Only difference is that humans
have consciousness which helps them to move by themselves.
No body can move until you put force on it and the force also have
to be unbalanced. If there is no force on the body then if it is stationary it
will remain in the stationary position and if it is in the motion, it will
continue to be in the motion with the same velocity.
So, now can you tell, why don’t we always observe these things in daily
life? Why don’t object in the motion continue to be in the motion?
This is because all the objects experience the force of friction
all the time which slows down the object and eventually stops.
Second law
of motion: (Also
called as law of momentum)
The rate of change
of momentum is directly proportional to the applied unbalanced force, in the
direction of force.
{ Mathematical
form of the second law
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}
Third law of
motion:
For every action
there is equal and opposite reaction and it acts on two different bodies.
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