Question: How does a lubricant help in reducing friction ?
Explanation : When a lubricant is added to a machine , it spreads between the two surfaces rubbing each other . On spreading of lubricant , the irregularities present on the surfaces are filled and it forms a thin layer between the surfaces in contact . As a result of it , the contact between the two hard surfaces is replaced by the contact between the hard surfaces and lubricant layer . Due to it the force of friction is reduced considerably .