Question

In the figure shown A and B are free to move. All the surfaces are smooth. Mass of A is $m$. Then:

• A. the acceleration of A will be more than $g\sin \theta$
• B. the acceleration of A will be less than $g\sin \theta$
• C. normal reaction on A due to B will be more than $mg\cos \theta$
• D. normal reaction on A due to B will be less than $mg\cos \theta$

Answer 1

The correct option is C normal reaction on A due to B will be more than $mg\cos \theta$

The weight of mass A will act in downward direction. To get the normal force, the components of mg can be considered as shown in the image. Therefore, option C is correct.