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Question

When a book is pushed across a table surface, which type of friction mainly opposes its motion?

This question was previously asked in
RRB NTPC 2025 Under Graduate CBT 2 Question Paper PDF (17-Sep-2026) (Shift 1)
The correct answer is

Sliding friction

Friction is the force that opposes the relative motion between two surfaces in contact.

When a book slides flat over a table, its surface moves directly against the table surface without rolling, so the resisting force is sliding (kinetic) friction.

Rolling friction applies to bodies like wheels or balls that roll, fluid friction (drag) acts on objects moving through a liquid or gas, and magnetic friction is not the force involved here.

Hence, the friction that mainly opposes the book's motion is sliding friction.

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