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Babatunde Onaola The Mechanical Engineering Technology (MT/0 (P1) REDUCES FRICTION AND WEAR. The surfaces of machinery components appear well-finished to the naked eye. When magnified, however, surface imperfections become readily apparent. These microscopic hills and valleys are called asperities. When dry surfaces move relative to one another, asperities may rub, lock together, and break apart. The resistance generated when these adjacent surfaces come in contact is called friction. The welding together and breaking apart of asperities is a form of adhesive wear. Another form of wear may occur when a hard contaminant particle becomes trapped between two opposing surfaces. When this occurs, the contaminant acts as a miniature lathe, cutting into the softer machinery surface. This process is termed abrasive wear. Another Consequence of friction is that the energy created by resistance is converted into heat. The primary functions of a lubricant, then, are the formation of a protective film between adjacent surfaces...

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