hi can u plzzz help.
urgent plzzzz.
Answers
Tyre tread patterns are made such that they expel any dirt or water that gets caught between the tyre and the road.
Lesser the tread on a tyre, the better for dry and clean roads. But they are completely useless on wet or gravelly roads. (Such tyres are called “Slick tyres” and are used in race cars which run on dry race tracks)
Rough and unpaved roads will need knobby tread to lock itself against the loose gravel and make sure that the gravel doesn't get stuck in the tyre.
Wet roads will require the treads which you most often see on the road going tyres. They dispel water from under the wheel and provide better grip on wet surfaces.
As it turns out, the only thing that impacts friction is the type of surfaces interacting and the weight of the object. Heavier objects have a larger frictional force. But, if you use objects of the same weight, no matter how the weight is spread out, the frictional force will be the same.