Question

Two blocks of mass $2kg$ and $4kg$ are released from rest over a smooth inclined plane of inclination ${30}^o$ as shown in figure. What is the normal force between the two blocks?

• A. $zero$
• B. $20N$
• C. $40N$
• D. $30N$

Answer 1

The correct option is A $zero$

Given surface is smooth. So, acceleration of both blocks are same $gsin\theta$=${10}^{0}sin{30}^0$ =$5m/s^2$ down the inclined plane plane.Thus both blocks will move together with same acceleration.

Therefore, normal reaction between the both blocks will be zero.