If you had a 50kg weight on Earth, it would weigh ~zero on the space station. It would still have a mass of 50kg--meaning it would difficult to move, and hurt very bad if it wumped you on the head, but placed on a scale, it would show 0.
Likewise, if you had that 50kg weight and a scale on an elevator here on Earth, the scale would read 50kg. Say at the top of a 100 floor building, the elevator's cable and safety devices broke and the elevator, you, the 50kg weight and the scale were all in free fall. For a very short time, the 50kg weight would weigh zero. You would weigh zero. The scale would weigh zero.
Until the elevator hit the ground.
No.
Yes. At least, the gravity resulting from planet Earth.
Yes; the gravity from different sides should cancel, for a net result of zero gravity.
No. At the centre of the earth the acceleration due to gravity is ZERO
There is not zero gravity on the moon. The moon has weaker gravity compared to Earth due to its smaller mass, but it still has gravity. Astronauts appear to be weightless on the moon due to them being in free fall around the moon.
Acceleration due to the earth's gravity is zero at the center of the Earth because at that point the mass of the earth is equally distributed in all directions, so pulling equally in all directions for a net zero pull. Simplistically, acceleration due to gravity decreases as distance from the center decreases. At the center the distance is zero, hence gravity is zero.
The gravity at the center of the Earth is zero because the mass around you causes gravity to be in equilibrium. It is pulling in all directions equally, resulting in a net zero gravitational force at the center.
when object fall free like at centre of earth that we call freefall with zero gravity.
A two-ton bus would have zero weight in zero gravity, since weight is dependent on the force of gravity. However, gravity has an infinite range, so gravity would only actually be zero at an infinite distance from the source of the gravity.
There is no "zero gravity" place. Gravity permeates all the universe. Astronauts in orbit are often said to be in zero gravity but they are, in reality, on a position where their orbital velocity balances the attraction of the Earth.
No
Yes; the gravity from different sides should cancel, for a net result of zero gravity.