Question
Mon August 18, 2008 By:

why do tyres have a better grip of the road while going on a level road than while going on an incli

Expert Reply
Mon October 20, 2008

On an inclined plane (or hill),
              normal reaction from the plane = the component of weight(mg)of vehicle  perpendicular to the plane (which is mg cosθ where θ is  angle of inclination) only 

whereas on a level ground,
                   normal reaction = the entire weight(mg) of the vehicle.

Friction is directly proportional to the normal reaction, so tyres experience more friction on level ground and hence hold a better grip than on the inclined plane.

 
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