Zero Gravity Chamber NASA Space

The apocryphal apple that fell on Newton’s head can be used to illustrate the issues involved. An apple weighs approximately 1 newton (0. 22 lbf). This is the weight1 of the apple and is considered to be a constant even while it is falling. During that fall, its weight2 however is zero: ignoring air resistance, the apple is stress free. When it hits Newton, the sensation felt by Newton would depend upon the height from which the apple falls and weight2 of the apple at the moment of impact may be many times greater than 1 N (0. 22 lbf). It is this weight2 which distorts the apple. On its way down, the apple in its free fall does not suffer any distortion as the gravitational field is uniform.