Weightlessness Video Lecture | Physics for Airmen Group X - Airforce X Y / Indian Navy SSR

Appling tweet and weightlessness
astronauts who are orbiting the Earth
experienced a sensation of
weightlessness
this is similar to the sensation you
experience on a giant wheel or a roller
coaster to understand what causes
weightlessness an idea about true weight
and apparent weight is necessary
true weight and apparent weight the
weight or true weight of a body is equal
to the force exerted by the earth on it
the two weight of a body of mass M is
given by the relation W is equal to mg
the weight of a body is measured with
the help of a weighing machine or by a
spring balance when a body is kept on
the platform of a weighing machine its
weight is given by the normal contact
force between the body and the platform
of the machine
similarly when a body is suspended from
a spring balance its weight is given by
the normal contact force between the
spring and the body when the body is
placed on the wing machine the forces
acting on the body are the force of
gravity or its weight W acting downwards
the upward normal contact force n
exerted by the platform of the machine
it is this upward normal contact force
exerted by any supporting surface which
gives a feeling of weight this upward
normal contact force is called the
apperent weight of the body the value of
this upward normal contact force n
depends upon the state of motion of the
body
to understand the concept of aberrant
weight let us imagine a person standing
on a wing machine
placed on the floor of an elevator now
observe the position of the pointer of
the wing machine when the elevator is at
rest
when the elevator moves down with a
constant acceleration
when the elevator moves upwards with a
constant acceleration
and when the elevator falls freely
we observe that the aberrant weight
registered by the machine is equal to
the true weight of the body less than
the true weight of the body
more than the true weight of the body
and equal to zero
that is the afferent weight of a body
depends upon the state of motion of the
body to find out why there is a
variation on weight click on the links
provided
and the elevator is at rest the person
inside it is also at rest external force
is equal to zero therefore the true
weight of the person W acting vertically
downwards is equal to the normal force
in acting vertically upwards in this
case the winged machine registers the
true weight of the body
when the elevator moves down with a
constant acceleration a the net force
acting on the person is equal to true
weight of the person - normal contact
force n is less than the true weight mg
of the person does the scale reads less
than the true weight of the person
you
when the elevator moves upwards with an
acceleration a net force acting on the
person is equal to true weight of the
person - normal contact force and is
greater than the true weight of the body
therefore the scale reads more than the
true weight of the body
when the elevator falls freely that is
if it's cable breaks then both the
person and the wing machine fall with
the same acceleration mg is equal to mg
minus N or n is equal to mg minus mg
that is equal to zero does the Apple
onto 8 of a freely falling person or
body is zero that is the person or a
body appears weightless when falling
freely under the influence of gravity at
this stage the winged machine will greet
zero thus we see that during the state
of weightlessness the force of
attraction due to gravity does not
become zero it is the aberrant weight of
the body which becomes zero
during weightlessness
weightlessness in space the spaceship
and the astronaut orbiting the Earth at
a certain height are actually in a
continuing state of freefall towards the
Earth as a result the astronaut does not
exert any force on the sides or floor of
the spaceship and the sides or the floor
of the spaceship do not push the person
up the astronaut therefore experiences
weightlessness while orbiting around the
earth
you