Question

Give reason

parts of machines are regularly oiled and greased....​

Answer 1

Explanation:

Machine parts are frequently oiled or greased to reduce friction and help in the smooth running of the machine. Continuous usage of any machine results in friction in their parts which ultimately leads to wear and tear of the machine parts.

The engine comprises of mechanical parts that work together to drive the machine.

It is important to use lubricants because they help to decrease the friction between the metallic components.

People can also use grease in place of oil for lubrication to smoothen the different parts of the machine to a great extent

Answer 2

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A liquid barrier between solid parts serves three purposes.

• When the solid parts come into sudden contact, the impact may break or fracture the parts. The oil absorbs much of the impact slowing the momentum at the point of contact.
• When solid parts remain incontinuous contact, imperfections in the materials may through friction wear against each other causing the parts to slowly erode away or deform. The oil creates a barrier between the parts that fills in the imperfections and reduces the frictional contact between the parts.
• The same friction may produce heat harmful to the parts themselves, or to other parts or people nearby. The oil helps to absorb the heat, especially if it is a recycled coolant.