state what is observed when a stone is dropped through a viscous fluid.

Question

state what is observed when a stone is dropped through a viscous fluid. Pay respect to the following
1. upthrust
2. weight that acts upwards
3. viscous force opposing the motion

Answer 1

Hello Bertina

When a small stone is dropped in a viscous liquid

(1)The wt mg acts down wards

( 2) an upthrust = (Volume of stone * density of liquid * g )acts upwards  ( = Vdg)

(3) A viscous force also acts upwards which increases as the downward speed of stone increases

As a result of these three forces the stone first accelerates downwards for some distance and then acquires a constant velocity called terminal velocity

At this stage the net force on the stone is zero , as the three forces creat zero net force on the stone