please ans it in one word
1. A substance that forms a thin layer between the two surfaces in contact.
2. The process of reducing friction of uneven surface.
3. Friction experienced by a body when it rolls over the surface of another.
4. A common way of reducing friction between two surfaces .
5. Frictional force exerted by fluids.
Answers
Answer:
1) Boundary friction
Answer: boundary friction It is the friction, experienced between the rubbing surfaces, when the surfaces have a very thin layer of lubricant.
2) By polishing the surface, as polishing makes the surface smooth and friction can be reduced. Using lubricants such as oil or grease can reduce the friction between the surfaces. When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings.
3) When a body rolls over another, frictional force experienced by the body is known as rolling friction. ... Explanation: When a body slides over another, the frictional force experienced by the body is known as sliding friction.
4) Reducing Friction
There are several ways to reduce friction: The use of bearing surfaces that are themselves sacrificial, such as low shear materials, of which lead/copper journal bearings are an example. Replace sliding friction with rolling element friction, such as with the use of rolling element bearings.
5) Drag is the resistance force or friction force in fluid. The rolling friction is a resistive friction when a body rolls on a surface. The dynamic friction is the friction that must be overcome to maintain steady motion of one object relative to another because they remain in contact.
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