Rolling Friction

  • Consider a situation of the ring or a sphere rolling without slipping over a horizontal plane.In this case there is only one point of contact between the body and the plane

  • The frictional forces developed between two surfaces in case described above is called rolling friction

  • Rolling friction developes between two surfaces when one body rolls over the surface of another body

  • We know that it is very difficult to pull a heavy metal box on a rough surface and if we attah four metal wheel to the box it becomes easiar to move the box on the same surface

  • Thus resistance offered by the surface during rolling is relatively less than offered during sliding friction

  • This is because while rolling surfaces in contact do not rub each other

  • Rolling friction is negligible in comparision to the kinetic and static friction which are present simlutanously

  • In many parts of the machine where this type of friction is undesirable ball bearings(small steel balls) are generally kept between the rotating parts of the machines.This ways power dissipation during the motion can be reduced

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