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# does friction depends on area under contact force??????     EXPLAIN WITH FBD N LOGICAL REASON

SAGAR SINGH - IIT DELHI
879 Points
10 years ago

Dear student,

Friction force has NO "surface area" component. This is hard to understand (and it sounds like the teacher who asked this question doesn't quite understand either...).

Imagine this-- A block of wood with a flat bottom and a legged wooded stool sit on a smooth inclined plane. Do we have to know the contact area (surface area) of the block or the stool legs to determine the angle at which each will slide? No. We merely need to know the applied weight and the coefficient of friction between the materials.

So why does a dragster have such big smooth tires? Wouldn't thin knobby bicycle tires do as well? As far as the friction force is concerned, Yes. But the issue the dragster faces is how to transfer the engine power to the asphalt to accelerate the car. This involves HUGE problems of material strength, power, heat and wear that takes the problem far outside the narrow concerns of friction force.

All the best.

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Sagar Singh

B.Tech, IIT Delhi

Rohit Singh
33 Points
10 years ago

yes offcourse..Frictional force depends on the are of contact. you must be knowing that friction force is an electrostatic force which arises due to the attraction b/w the + and - elements of the bodies in contact...now larger the area larger will be the force b/w the bodies.