Question

what are used in the machine to protect their surfaces from wear due to friction.​

Answer 1

Answer:

Lubrication between machine parts.

Answer 2

Answer:

lubricants

Explanation:

substances known as lubricants are used in the machine to protect their surfaces from wear due to friction.

they fill the irregularities on the surface and make it smooth.

examples are oil and grease in liquids

and

graphite in solids.