Multiple choice

If a heavy suitcase is fitted with rollers, then it can be pulled very easily. It is because rollers convert

  1. sliding friction into rolling friction

  2. rolling friction into sliding friction

  3. static friction into sliding friction

  4. rolling friction into static friction

  5. sliding friction into static friction

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A Correct answer
Explanation

This is the correct option. If a heavy suitcase is fitted with rollers, then it can be pulled very easily. It is because rollers convert sliding friction into rolling friction.