关于物理的英语论文
你如今好吗-
The research about motion of falling bodies
In
the past, it is unbelievable that we use
‘
displacement
’
、
‘
velocity
’
、
‘
speed
’
、
‘acceleration’
to
describe the motion of objects. For centuries, we
just can use word based on the writing
of the Greek philosopher Aristotle
to
describe the motion of objects.
Aristotle asserted that any object,
after it is released, quickly reaches
some final speed, which it maintains to
the end of its path. When we pick
up a
stone and release it, the stone strives to return
to its natural place and
quickly gets a
speed that it maintains during its entire fall.
According to
the
common
observation
that
a
heavy
stone
fall
faster
than
a
feather,
Aristotle reasoned that weight is a
factor that governs the speed of the fall.
Consequently, the heavier the object,
the greater would be its potential to
return
to
the
earth.
This
description
of
motion
is
in
accordance
with
common observation of falling leaves,
raindrops and stones. In all cases,
the
body encounters resistance to its fall from the
air. But what if there
were no air to
offer resistance and impede the fall? How would
objects
fall
through
a
vacuum?
Aristotle
argued
that
all
bodies,
in
a
vacuum,
being
unresisted,
would
fall
with
the
same
infinite
speed.
But
he,
like
most other ancient
Greeks, considered infinity as an incoherent
concept.
Aristotle dismissed motion
through a void because he concluded that the
vacuum could not exist.
Above
all
we
have
examined
present
a
qualitative
description
of