A spherical ball is dropped in a long column of viscous liquid. Which of the following graphs represent the variation of

(l) gravitational force with time
(ii) viscous force with time
(iii) net force acting on the ball with time

Options

A. Q,R,P
B. R,QP
C. P,Q,R
D. R,P,Q

Answer

3

Explanation

Gravitational force remains constant on the falling splercial ball. It is represented by straight line P. The viscous `force3e" "(F=6pietarv)` increases as the velocity increases with time. Hence, it is respresented by curve Q. Net force = gravitational fone-viscous force. As viscous force increases, net brce decreases and finally becomes zero. Then they body falls with a constant terminal velocity. It is the represented by curve R.