Question

# Case I: A block of mass 1 kg is placed on a rough horizontal surface. Case II: A block of mass 1 kg is placed on a rough horizontal surface and another identical block is kept over it. Choose the correct statement.

A
Static friction is greater than sliding friction.
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B
Sliding friction is greater than static friction
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C
No frictional force acts after the cart comes in motion.
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D
Air friction is greater during first few steps of motion.
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Solution

## The correct option is D Static friction is greater than sliding friction.Static friction comes into picture only when there is a tendency of relative motion between surfaces in contact. Here, in both the cases, no external force is acting in horizontal direction. Hence, no friction will act on the blocks.

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