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.
IIT JEE
Physics
Difficulty: Easy
Choose an option
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ARolling friction is much smaller than sliding friction
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BBarrels are lighter when rolling
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CAir resistance disappears when rolling
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DThe normal reaction becomes zero during rolling
Answer
Correct Answer: Rolling friction is much smaller than sliding friction
Explanation
ConceptSliding involves kinetic friction (μkN), 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