# There is the following relation of surface stresses with sliding friction and the existence of lubricant:

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There is the following relation of surface stresses with sliding friction and the existence of lubricant:
1. Directly
2. Affected
3. Inversely
4. Unaffected

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Correct Answer - Option 4 : Unaffected

Explanation:

Surface stresses:

• It refers to the localized stresses that develop as two curved surfaces come in contact and deform slightly under the imposed loads.
• These surface stresses are a function of the normal contact force, the radii of curvature of both bodies and the modulus of elasticity of both bodies.
• Surface stresses remain unaffected by sliding friction and the existence of lubricant. Because of:
• Surface stresses developed due to external forces acting on the body for a given specific area of application.
• These stresses don't get affected by sliding friction as generally acts normal to contacting surface.
• The existence of lubricant can lower the value of the coefficient of friction hence affecting sliding friction.

Hence, we can conclude that the relation of surface stresses with sliding friction and the existence of lubricant remains unaffected.