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Easy Java Simulations (2001- ) => dynamics => Topic started by: ahmedelshfie on May 31, 2010, 06:02:37 pm



Title: falling with air resistance
Post by: ahmedelshfie on May 31, 2010, 06:02:37 pm
This applet is falling with air resistance
Created by prof Hwang Modified by Ahmed
Original project requesting for simulations for object falling with air resistance/board:26-100- (http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1536.0)

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 = bv2)