Friction is helpful because it is helpful to stop vehicles or any other thing. friction creates a problem when we cycle because we have to apply force to run our cycle if we not apply force then cycle will stop
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Friction help us a lot in many ways for example for stopping a cycle by applying brakes due to the frictional force for writing ,for walking,even we can't sit properly in the absence of frictional force.
the coin has two faces ,similarly frictional forces has disadvantages also like frictional forces cause wear and tear of clothes,shoes lb lubricant is required for machines
overall it has great advantage over it's disadvantages
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