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← ScienceWhich frictional effect rises with engine oil temperature drop?
A)Increased viscous drag effects✓
B)Reduced surface tension effects
C)Declined turbulent kinetic energy
D)Enhanced convective heat transfer
💡 Explanation
Lowering the temperature increases the viscosity of engine oil, creating greater viscous drag, because viscosity grows as temperature drops. Therefore viscous drag increases, rather than surface tension decreasing or convection increasing which require heat input.
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