Two blocks rest on a horizontal frictionless surface as shown.The surface between the top and bottom blocks is roughened so that there is no slipping between the two blocks.A 30-N force is applied to the bottom block as suggested in the figure.
-Note the following situations: In which case will the magnitude of the normal force on the block be equal to (Mg + F sin $\theta$)?
A)case 1 only
B)case 2 only
C)both cases 1 and 2
D)both cases 2 and 3
E)cases 1, 2, and 3

Question

Two blocks rest on a horizontal frictionless surface as shown.The surface between the top and bottom blocks is roughened so that there is no slipping between the two blocks.A 30-N force is applied to the bottom block as suggested in the figure. 
-Note the following situations:  In which case will the magnitude of the normal force on the block be equal to (Mg + F sin $\theta$)?
A)case 1 only 
B)case 2 only 
C)both cases 1 and 2 
D)both cases 2 and 3 
E)cases 1, 2, and 3

Quizplus · Accepted Answer

The Answer of Two blocks rest on a horizontal frictionless surface as shown.The surface between the top and bottom blocks is roughened so that there is no slipping between the two blocks.A 30-N force is applied to the bottom block as suggested in the figure. 
-Note the following situations:  In which case will the magnitude of the normal force on the block be equal to (Mg + F sin $\theta$)?
A)case 1 only 
B)case 2 only 
C)both cases 1 and 2 
D)both cases 2 and 3 
E)cases 1, 2, and 3

Two Blocks Rest on a Horizontal Frictionless Surface as Shown θ\thetaθ

Two Blocks Rest on a Horizontal Frictionless Surface as Shown $\theta$