Question

3. Oil is applied to the moving parts of a machine.​

Answer 1

Answer:

Lubricants like oil, grease etc. fill up the irregularities of the surfaces, making them smoother. Hence, friction decreases. Lubrication forms a layer between the two surfaces filling the spaces between the interlocks and making machine smoother to move.

Answer 2

As machines are made up of metals or usually irons, it gets corroded or gets rusted because of which the machine will not work properly and it will produce sound.

As machines are made up of metals or usually irons, it gets corroded or gets rusted because of which the machine will not work properly and it will produce sound.To prevent this, oil is applied to the parts of the machine. Because of this it works properly.