A person or object is inside an accelerating elevator or descending box, and the question asks about apparent weight, normal reaction, or conceptual understanding of weight change.
A block of mass $M$ placed inside a box descends vertically with acceleration $a$. The block exerts a force equal to one-fourth of its weight on the floor of the box. The value of $|a|$ will be (1) $g$ (2) $\frac{3g}{4}$ (3) $\frac{g}{2}$ (4) $\frac{g}{4}$