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10 Questions

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Lubricants and Surface Contact

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Questions and Answers

What is the main effect of sliding friction?

The interlocking of the surface irregularities

Deformation effect on the metal surface

Ploughing i.e., cutting out the softer material by the asperities of the harder materials (correct)

Rolling of a load sphere or cylinder over a flat surface

What causes the weed junction that carries all the loads between two solid surfaces?

The interlocking of the surface irregularities

The deformation effect on the metal surface

The contact of the asperities of both the upper and lower surfaces (correct)

The sliding of two materials of different hardness over one another

What type of friction occurs when a load sphere or cylinder rolls over a flat surface?

Dynamic friction

Sliding friction

Static friction

Rolling friction (correct)

What is the relative movement of two surfaces in contact with each other called?

Friction Signup and view all the answers

What is the true area of contact between two surfaces in comparison to the apparent contact area?

Only a small fraction of the apparent contact area Signup and view all the answers

What does chemistry study?

Properties and behavior of matter Signup and view all the answers

What does chemistry provide a foundation for understanding?

Basic and applied scientific disciplines Signup and view all the answers

What does chemistry explain in the field of pharmacology?

How medications work Signup and view all the answers

In what ways does chemistry contribute to ecology?

Formation of atmospheric ozone and degradation of environmental pollutants Signup and view all the answers

What is the relationship between chemistry, physics, and biology?

Chemistry occupies an intermediate position between physics and biology Signup and view all the answers