Weightlessness in Space

♤ At the height of 400 km, gravitational force of space is not absent still astronauts feel weightlessness.

♤ This is connected with the relative motion of astronauts with earth and spacecraft.

♤ All objects inside the spacecraft including the spacecraft itself is falling around the earth, thus every object inside the craft is in the same motion as the craft which produces a feeling of weightlessness.

♤ This is equivalent to feeling of weightlessness within a free falling elevator where both elevator and persons within the elevator are accelerated at the same rate towards earth.