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Question

Choose the correct option(s) regarding treading on tyres.


  1. Having treads ensure tyres do not skid or slip on a rainy day

  2. Having treads differentiates one brand of tyre from the other

  3. Having treads in racing cars reduce friction and hence is undesirable

  4. Having treads is advantageous as it increases the thickness of the tyres


Solution

The correct options are
A

Having treads ensure tyres do not skid or slip on a rainy day


C

Having treads in racing cars reduce friction and hence is undesirable


Treads on the tyres help in increasing grip on soft surfaces. Treads sink into soft surfaces and thereby increasing the grip. This relates to the plowing effect where friction exists when a soft surface gets pressed on because of the deformations on the softer surface. The presence of these treads trap water typically on a rainy day and spills it out - which helps in improving grip while moving on wet surfaces.
The presence of these treads reduce friction. This is one reason why racing cars do not have treads on their tyres. 

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