Aristotle ever said “ the body
moved because they were acted upon by a force”. Another Aristotle’s statement
was “the body stopped moving when they get tired” this statement very confusing
but, acceptable by most of people. But
Galilleo was the one who against his ancestor. Galilleo asked himself “why do
the bodies move and why do they stop?”. He
introduced a new term called inertia. Every body has inertia. More mass, more
inertia. A havier body has greater inertia due to greater mass, thus it will
resist any change to it’s state.
And Galileo started with rolling
marble. He found that when he released a marble from high “S” from the first
inclined plane. The ball tries to reach the same height on the second inclined
plane. He was surprised. Than, he also reduced the angle of the second incline
plane. The marble moved further distance in order to reach the same height from
where it was relased. The nature
loves balanced but, Let we assume
how if we reduced the incline plane to zero?
Yes, most of people could answer
that, it will be stop when the ball
reached some distance. But why the ball stop? Doesn’t the nature loves balanced?.
Let me explain, the ball will stop because of external force like floor friction
that opposite the direction of the ball. In case, without any external forces
like the ground was frictionless ,the ball should roll on forever with uniform
velocity, In order to reach the same heights of second plane. And Newton used
Galilleo’s discover and converted into Newton’s three laws of motion. To the
next time we will discuss about The Newton’s law of motion. See you
