Mark the direction of frictional force,and mention the kind of frictional force that comes into play,in each case.
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Friction came into play when it irregularities have been present in the surface of two objects. It the direction is in opposite to the motion, the body aligned to the center and hence frictional force is always directed in the opposite direction. Therefore, lesser force is required to overcome interlocking.
explaination:Frictional force acts in a horizontally opposite direction to the direction of motion.
Static friction comes into being when two objects are at rest with respect to each other .
Rolling friction comes into being when one object rolls over the other.
Sliding friction comes into being when one object slides over the other.
Fluid friction is the friction between an object on a liquid surface and the liquid and it depends upon the viscosity of liquid.
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