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The drag force exerted by a fluid on a body immersed in the fluid is dueto:
- a)Pressure and viscous forces
- b)Pressure and gravity forces
- c)Pressure and surface tension forces
- d)Viscous and gravity forces.
Correct answer is option 'A'. Can you explain this answer?
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The drag force exerted by a fluid on a body immersed in the fluid is d...
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Pressure and Viscous Forces:
The drag force experienced by a body immersed in a fluid is primarily due to the pressure and viscous forces acting on the body.
Pressure Force:
- The pressure force is caused by the pressure gradient in the fluid around the immersed body.
- As the fluid flows around the body, there is a variation in pressure which exerts a force on the body in the opposite direction of its motion. This force is known as the pressure drag.
Viscous Force:
- Viscous forces are a result of the fluid's resistance to deformation as it flows around the body.
- The fluid in contact with the body's surface experiences a shear stress due to the relative motion between the fluid and the body.
- This shear stress creates a viscous drag force that opposes the motion of the body through the fluid.
Combined Effect:
- The combined effect of pressure and viscous forces results in the total drag force experienced by the immersed body.
- The pressure drag dominates at low Reynolds numbers, while the viscous drag becomes significant at higher Reynolds numbers.
Therefore, the drag force on a body immersed in a fluid is primarily due to the combination of pressure and viscous forces acting on the body.
The drag force experienced by a body immersed in a fluid is primarily due to the pressure and viscous forces acting on the body.
Pressure Force:
- The pressure force is caused by the pressure gradient in the fluid around the immersed body.
- As the fluid flows around the body, there is a variation in pressure which exerts a force on the body in the opposite direction of its motion. This force is known as the pressure drag.
Viscous Force:
- Viscous forces are a result of the fluid's resistance to deformation as it flows around the body.
- The fluid in contact with the body's surface experiences a shear stress due to the relative motion between the fluid and the body.
- This shear stress creates a viscous drag force that opposes the motion of the body through the fluid.
Combined Effect:
- The combined effect of pressure and viscous forces results in the total drag force experienced by the immersed body.
- The pressure drag dominates at low Reynolds numbers, while the viscous drag becomes significant at higher Reynolds numbers.
Therefore, the drag force on a body immersed in a fluid is primarily due to the combination of pressure and viscous forces acting on the body.
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The drag force exerted by a fluid on a body immersed in the fluid is dueto:a)Pressure and viscous forcesb)Pressure and gravity forcesc)Pressure and surface tension forcesd)Viscous and gravity forces.Correct answer is option 'A'. Can you explain this answer?
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