Weightlessness is
A. Zero gravity
B. When gravity decrease
C. In vacuum
D. None of the above
Answer: Option A
Solution (By Examveda Team)
Weightlessness is the condition in which a body experiences no net force of gravity acting on it.It does not mean that gravity disappears, but rather that both the body and its surroundings are in a state of free fall under the influence of gravity, creating the sensation of zero weight.
Option B: Incorrect, because weightlessness is not due to decrease of gravity but due to free fall where gravitational pull is not felt.
Option C: Incorrect, because even in a vacuum, gravity acts on bodies (for example, planets and satellites move in vacuum under gravity).
Thus, weightlessness is correctly defined as zero gravity.
This Question Belongs to Physics GK Chapter Wise >> Gravitational Force
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The movement of the Moon around the Earth is due to . . . . . . . .
A. Gravitational force
B. Centrifugal force
C. Concentric force
D. Nuclear force
Which one of the following statements about a satellite orbiting around the earth is correct?
A. Satellite is kept in orbit by remote control from ground station
B. Satellite is kept in orbit by retro-rocket and solar energy keeps it moving around the earth
C. Satellite requires energy from solar panels and solid fuels for orbiting
D. Satellite does not required any energy for orbiting
What will happen if an object is thrown into space with the speed of 8 km/s?
A. The object will go into space
B. It will return to Earth
C. It will rotate into the orbit of Earth
D. It will burst out
Astronauts feel . . . . . . . . weight inside the spacecraft.
A. more
B. less
C. zero
D. depends on G force
Answer should be D. None of the above
Weightlessness doesn't mean zero gravity