Assertion: The machine parts are jammed in winter. Reason: The viscosity of the lubricants used in the machines increases at low temperature.

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Assertion-ReasonViscosity of Fluids

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Assertion: When fluid flows, there is some loss of energy due to friction. Reason: Different layers of the fluid exert forces on each other.

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A rectangular plate of 10cm × 5cm is moving at constant rate of 2 cm/s on a 0.5 mm thick layer of glycerine on a horizontal table at 20℃. If the coefficient of viscosity of glycerine at 20℃ is 830 mPl, find the velocity gradient and force acting on the plate.

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