Friction can be reduced by which of the following I Polishing surfaces II Use of lubricants III Decr...........

Static GK (CPO) General Science

Friction can be reduced by which of the following?

I. Polishing surfaces

II. Use of lubricants

III. Decreasing area of contact

Only I

Only II

Only I and II

All options are correct

- I. Polishing surfaces:

- Polishing makes surfaces smoother by reducing microscopic roughness, which decreases friction.

- This is effective for reducing sliding friction.

- II. Use of lubricants:

- Lubricants like oil or grease create a thin layer between surfaces.

- This layer reduces direct contact and decreases friction significantly.

- III. Decreasing area of contact:

- Friction depends on normal force and the materials in contact, not on the contact area.

- Reducing the contact area does not effectively reduce friction, because the pressure increases.

- Option 1: Only I

- Includes only polishing, missing lubricants, which are crucial.

- Option 2: Only II

- Excludes polishing, which also effectively reduces friction.

- Option 3: Only I and II

- Includes both polishing and lubricants, the correct combination to reduce friction effectively.

- Option 4: All options are correct

- Incorrect because decreasing area of contact isn't an effective way.

Submit Error