Question

A rain drop of mass 0.1g is falling with uniform speed of 10cm/s. What is the net force acting on the drop

Answer 1

the net force will be zero

Answer 2

Answer:

Zero

Explanation:

Given that:

A raindrop of 0.1 gram which is falling at uniform velocity of 10 centimeters per seconds. The net force acting on the drop is zero which means that the gravitational force acting on the drop is balanced by the drag force.

The force of gravity on any body is given by:

$F_g=m.g$

where:

m = mass of the body

g = acceleration due to gravity

And the drag force is given as:

$F_d=C_d.\rho.A.\frac{v^2}{2}$

where:

$C_d=$ coefficient of drag

$\rho =$density of the medium in which the object moves

$A=$ area projected normal to the direction of velocity

$v=$ velocity of the object

In this case when the two forces, are equal to each other then the uniform velocity attained by the body is called terminal velocity. ($=10\ m.s^{-1}\ here$)