why water attract a thin plastic sheet . Difference between upthrust and this force of attraction
Answers
Answered by
0
Upthrust or buoyant force : It is the force that acts on bodies submerged/floating in fluid in a direction opposite to that of the pressure gradient in the fluid( in a stationary fluid pressure gradient is the direction of the gravity), having a magnitude equal to the weight of the displaced volume.
Viscous force: Because of no-slip condition ( layer of fluid in contact with the solid surface will have the velocity of the solid surface or would stick to it), fluid layers will have a relative motion such that velocity will vary from the layer in contact having vel of the solid surface and vel far away from the solid will have free stream velocity. Now a property of fluid called viscosity (similar to friction for solid bodies) creates a force which tries to stop the relative motion among layers. This force is called viscous force.
Note:
Other than the basic definition, another difference between the two is that upthrust is a normal force whereas viscous forces are shear forces.
MARK BRAINLIEST...
Viscous force: Because of no-slip condition ( layer of fluid in contact with the solid surface will have the velocity of the solid surface or would stick to it), fluid layers will have a relative motion such that velocity will vary from the layer in contact having vel of the solid surface and vel far away from the solid will have free stream velocity. Now a property of fluid called viscosity (similar to friction for solid bodies) creates a force which tries to stop the relative motion among layers. This force is called viscous force.
Note:
Other than the basic definition, another difference between the two is that upthrust is a normal force whereas viscous forces are shear forces.
MARK BRAINLIEST...
Similar questions