Question

A block of mass M slides down on a rough inclined plane with constant velocity. The angle made by the inclined plane with horizontal is θ.The magnitude of the contact force will be

• A. $Mg$
• B. $Mg\cosθ$
• C. $\sqrt{Mg\sinθ+Mg\cosθ}$
• D. $Mg\sinθ\sqrt{1+μ}$

Answer 1

Answer: (A)

$Mg$

Answer 2

The correct answer is (A): $Mg$
As the body is moving with constant velocity so forces acting on the body must be balanced.
⇒ Contact force from incline should balance weight of the body.
$⇒ |F_{contact}| = Mg$