Question

A block rests on a rough plane whose inclination angle $\theta$ with horizontal is increased (gradually), then contact force(C) between block & plane varies with $\theta$ (consider interval before block slips)

• A.
• B.
• C.
• D.

Answer 1

The correct option is C


$\overrightarrow{N}+\overrightarrow{f}+mg\left(down\right)=0$

$\overrightarrow{N}+\overrightarrow{f}$= $mg\left(up\right)$=$constant$
$N$ and $f$ are the only contact forces acting.