Concept explainers
What causes a wedge-shaped film to form in the oil?
State the reason for the formation of wedge-shaped film in the oil.
Explanation of Solution
Lubrication between two sliding surfaces is due to an oil film that segregates the surfaces and bears the load.
When the oil is placed over a plain surface and a large block is moved across the plain surface, the block will slide easily on the surface compared to moving across a dry surface. The reason is due to the formation of a wedge-shaped oil film between the surface and the sliding block. The wedge-shaped film in the oil makes the block to move easily on the plain surface.
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