Why sand is thrown on the tracks covered with snow?

Answer:

If the tracks are covered with snow then there is a substantial reduction in frictional force between the track and the train wheels or vehicle tyres and road which corresponds to the train being skidded. Therefore, driving is not safe. If sand is thrown on the snow-covered tracks or roads the friction force increases so that safe driving is achievable.

Friction force

Frictional force refers to the force generated by two surfaces that contacts and slide against each other. A few factors that influence the friction force:

  • These forces are largely influenced by the texture of the surface and the amount of force that brings them together.
  • The object’s angle and orientation influence the amount of frictional force.
  • If an object is pushed against the surface, then the force of friction is enhanced and becomes greater than the object’s weight.

 

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