Two Blocks Rest on a Horizontal Frictionless Surface as Shown

question 67

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.
-What is the force of static friction between the top and bottom blocks?

• A)zero newtons
• B)10 N
• C)20 N
• D)25 N
• E)30 N

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