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Q. No.Which one of the following statements is incorrect?
| 1. | Rolling friction is smaller than sliding friction. |
| 2. | The limiting value of static friction is directly proportional to the normal reaction. |
| 3. | Frictional force opposes the relative motion. |
| 4. | The coefficient of sliding friction has dimensions of length. |
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Subtopic: Â Friction |
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