define force of friction and factors affecting force of friction withexample
Answers
Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth.
Friction does not depend on the amount of surface area in contact between the moving bodies or (within certain limits) on the relative speed of the bodies.
It does, however, depend on the magnitude of the forces holding the bodies together. When a body is moving over a horizontal surface, it presses down against the surface with a force equal to its weight,
The factors which affect friction are:
The weight of the objective. That is the normal reaction which the surface applies on the object. For example it is always difficult to push a heavier object than a lighter one.
The coefficient of friction. That is the type of surface . For example wood has a rough surface which means higher coefficient of friction resulting in higher friction. And a smooth ice surface has a lower coefficient of friction resulting in less friction.
And frictional force is therefore given by :
F=uN
Where u= coefficient of friction
And N = normal reaction
The factors which affect friction are:
The weight of the objective. That is the normal reaction which the surface applies on the object. For example it is always difficult to push a heavier object than a lighter one.
The coefficient of friction. That is the type of surface . For example wood has a rough surface which means higher coefficient of friction resulting in higher friction. And a smooth ice surface has a lower coefficient of friction resulting in less friction.
And frictional force is therefore given by :
F=uN
Where u= coefficient of friction
And N = normal reaction
Answer:
The friction force is the force exerted by a surface as an object moves across it or makes an effort to move across it. There are at least two types offriction force - sliding and static friction.