Question

Explain how and why the velocity of an object changes when it falls in a viscous fluid. 2

Answer 1

How and why the velocity of object changes:-

To answer this let's first know what viscous fluid is, it is the measure of the resistance between the different layers of the fluid. Fluids having higher viscosity, their particles offered more resistance to the object which are flowing through them by decreasing their velocity.Basically Viscosity in liquids is caused by their molecular makeup or we can say that comperatievely too much viscous liquids have molecular makeups or adhesive or cohesive force among them that cause a great deal of internal friction when they move so they offers resistance to any object when iit tries to flow it.

Now in our case we have to deal with both cases for velocity of an moving object

When viscosity reduces: -

In this case the resistance between the layers of the viscous liquid is low or we can say that they will offer less resistance when any object flows through it.

When viscosity increases:-

In this case the frictional force between the layers of the liquid is very high or their particles shows more cohesiveness among its internal particle so they reduces the velocity of the moving object through it.