Question

explain the concept of weightlessness​

Answer 1

$\large\bigstar{\underline{\rm{\blue{\:Weightlessness:-}}}}$

→ A body is said to be in a state of weightlessness when the reaction of the supporting surface is zero or apparent weight is zero.

$\large\bigstar{\underline{\rm{\blue{\:Situations\:for\:state\:of\:weightlessness:-}}}}$

→ When a lift freely under gravity

→ When bodies are at null points in outer space.

→ When a satellite revolves in its orbit around the earth.

→ When the body is at centre of the earth.

$\large\bigstar{\underline{\rm{\blue{\:Weightlessness\:of\:a\:spacecraft:-}}}}$

→ In a spacecraft, all the gravitational pull is used to provide the necessary centripetal force to keep the spacecraft in the orbit.

→ There is no unbalanced force on the astronaut to make them fall towards the walls of the spacecraft.

→ Hence the astronaut experiences no weight. This condition is called weightlessness.

$\large\bigstar{\underline{\rm{\blue{\:An\:astronaut\:in\:a\:spacecraft \:feel\:weightlessness:-}}}}$

→ This is because the orbiting spacecraft along with the astronaut is in a state of free fall towards the earth.

Answer 2

$\large{\underline{\sf{\blue{WEIGHTLESSNESS}}}}$

$\implies$Weightlessness, condition experienced while in free-fall, in which the effect of gravity is canceled by the inertial (e.g., centrifugal) force resulting from orbital flight. The term zero gravity is often used to describe such a condition.

$\large{\underline{\sf{\blue{EFFECTS}}}}$

$\implies$One of the major effects of weightlessness that is more long-term is the loss of muscle and bone mass. In the absence of gravity there is no weight load on the back and leg muscles, so they begin to weaken and shrink