Question

can you explain weightlessness with example.

Answer 1

The phenomenon of "weightlessness" occurs when there is no force of support on your body. When your body is effectively in "free fall", accelerating downward at the acceleration of gravity, then you are not being supported.

Answer 2

If the gravitational force W of the power standing in the lift acts downwards and the reaction force R applied upwards, then both these forces will be in opposite direction, termed as WEIGHTLESSNESS.

Explanation:

If the lift is stationary or moving with the same velocity up or down, then F = O and W = R

If the lift is moving upwards with the same acceleration, a, then F = ma where m is the mass of the person.

R = W + ma

In this case the virtual weight of the person is more than his actual weight mg.

If the lift is moving downward from the same acceleration, a. In this case, F = ma and virtual load, R = W - ma

In this case the person's virtual weight will be less than his actual weight.

If the lift falls down freely then a = g and virtual load,

R = W-mg = mg -mg = 0

This condition is the assumption of weightlessness.

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