what is static friction ,kinetic friction, rolling friction with examples
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Kinetic friction -
The force acting between the surface two surface in relative motion. It is also called sliding friction.
Static friction -
The opposing or resisting force between two solid surface..
Rolling friction -
It is a form of kinetic friction which comes into play when a body such as wheel or cylinder rolls over a surface. It is a common experience that much less effort is needed to roll a drum of coal-tar than to drag it along over a surface. Mrans rolling friction is less than sliding friction. This is why vehicle runs on wheel. The reason of rolling friction being much less is that only a small portion of moving wheel is in contact with the ground at any instanr nd this portion is momentarily rest. No work done against friction.
The force acting between the surface two surface in relative motion. It is also called sliding friction.
Static friction -
The opposing or resisting force between two solid surface..
Rolling friction -
It is a form of kinetic friction which comes into play when a body such as wheel or cylinder rolls over a surface. It is a common experience that much less effort is needed to roll a drum of coal-tar than to drag it along over a surface. Mrans rolling friction is less than sliding friction. This is why vehicle runs on wheel. The reason of rolling friction being much less is that only a small portion of moving wheel is in contact with the ground at any instanr nd this portion is momentarily rest. No work done against friction.
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Answer:
Static friction :
Opposes the starting of motion.
Kinetic friction :Opposes the relative motion of the object with respect to the surface.
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