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CBSE - XI Science - Physics - Laws of Motion

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

Asked by 18th August 2008, 6:30 PM
Answered by Expert


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.

Answered by Expert 20th October 2008, 2:36 AM

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