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| 1. |
In rainy season sand is sometimes thrown on railway tracks. Why? |
| Answer» Solution :The force impressed on the wheel is generally greater than the force of rolling friction, this produces rolling of the wheel on the railway TRACK. On the other hand the kineticfriction is fairly higher that the impressed force and there is no sliding of the WHEELS. But in rainy SEASON on the wet railway track, there is a danger that the kinetic friction MAY drop below the impressed force resulting in a sliding of the wheels. To avoid this sand is sometimes thrown on the railway track to increase the kinetic friction. | |