We can understand sliding friction as the resistance force created between any two bodies when sliding against each other. This friction is also called kinetic friction and it is defined as the force that is required to keep a surface sliding along another surface. It hangs on two variables- one is material or the thing and the other is the weight and size of the object. Any variation in the surface area in contact does not change the sliding friction. In most materials, sliding friction is much less than static friction.
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