Question

Four cubical boxes are labelled A, B, C, and D. Boxes A and B are placed in a grass field, and boxes C and D are placed on marble floors as shown. Which box requires the maximum force to be moved?

• A. Box A
• B. Box B
• C. Box C
• D. Box D

Answer 1

The correct option is B Box B

Given,
$m_A$ = $m_C$ < $m_B$ = $m_D$
The frictional force is greater for heavier objects and smaller for lighter objects. Therefore, friction on box A < box B and friction on box C < box D. Now, we can say that the maximum force required to move the box is either of box B or D.
Also, we know that irregular surfaces like grass fields offer more frictional force than smooth surfaces like marble floors. Therefore, the frictional force on box B > box D.
Hence, box B requires the maximum force to move.