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question 6 a define the term lubricant and explain its...
Question: question 6 a define the term lubricant and explain its...
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![Question 6 (a) Define the term lubricant and explain its importance in tribology. Define the term additive. Why are additives used in lubricants? List various fami- lies of additives. [8 marks] (b) Explain the various lubrication regimes and how the regimes can be de- termined based on the lubricant film thickness and the roughness of the contacting surfaces. [10 marks] (c) A steel surface with conical asperities of an average semi-angle of 60° slides against a soft aluminium surface of hardness, H - 100 MPa un- der a constant normal load of 20N. Calculate the volume of aluminium displaced in unit sliding distance.](https://homework-api-assets-production.s3.ap-southeast-2.amazonaws.com/uploads/store/741189160/1602465619f4369c7d4a1b0a805f0a5f925ddeee6c.png)
