# friction - EA3 Friction Friction Friction is a force that...

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EA3 Friction Sridhar Krishnaswamy 1 Friction Friction is a force that acts to oppose the sliding motion of two dry bodies in contact. It always acts in opposition to actual or potential sliding motion. The root cause of friction has to do with asperities (bumps) on rough surfaces that tend to lock and possibly also due to interatomic forces that might partially “cold weld” the two surfaces in contact. Without really going into the root causes of friction (which is still an active topic of research), we can do a simple experiment to characterize frictional forces. Figure 1: Block sliding over a rough table. Consider a block of mass m resting on a table with a rough surface (fig. 1). Let us try to push the block by a force P so as to try and slide the block over the surface of the table. More specifically, let us increase this force P from zero and see what happens. We will find the block does not move up to some level of load P. This means that something must be opposing the applied force P and this has to be the frictional force ‘f’. Since the

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friction - EA3 Friction Friction Friction is a force that...

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