Solve this multiple-choice question and choose the correct option.

Rolling vs. pulling: Why is it easier to roll a heavy barrel than to pull/slide it? Compare the resisting forces involved during rolling and sliding on a rough surface. Choose the correct option.

Difficulty: Easy

Rolling friction is much smaller than sliding friction
Barrels are lighter when rolling
Air resistance disappears when rolling
The normal reaction becomes zero during rolling

Correct Answer: Rolling friction is much smaller than sliding friction

Explanation:

ConceptSliding involves kinetic friction (μ_kN), typically large; rolling involves rolling resistance due to deformation and contact, usually far smaller ⇒ less effort needed.

Final AnswerRolling friction is much smaller than sliding friction

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