What will happen if there are many objects with the same density but different size, all fall from the same height.
The terminal velocity $v=\sqrt{mg/b}=\sqrt{\rho Vg/b}$, so the terminal velocity is proportiobal to $\sqrt{V}$ where $V$ is the volume of the object.

The following simulation try to illustrate the size effect on terminal velocity.
The ratio of the mass for the object is 1:2:3:4:5:6:7:8:9
Because it is a 2D simulation, the radius is proportional to $\sqrt{m}$.

You can try it with different gravity g , or drag constant (Drag force = bv[sup]2[/sup])

/htdocs/ntnujava/ejsuser/2/users/ntnu/fkh/basic/terminalvelocitysets_pkg/terminalvelocitysets.propertiesFull screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list