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

question 91

Multiple Choice

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

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