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Intro Page You can change the liquid density or drag the object up/down to find out how the pressure(due to liquid) on the object are changed at different places around the object(Black Arrows).
The net force due to the pressure provide the buoyancy force.
The velocity vector is shown in red and acceleration is shown in blue.
In this model, we assume there is a drag force Fr=-b*vy when object is moving down, and the drag force is neglectable when moving up (may be this is not a good assumption). I would like to hear your suggestions.
I hope you can enjoy it! Enjoy the fun of Physics! You can access this simulation online from
Buoyancy force with drag force
Designed by Fu-Kwun Hwang (
Department of Physics, National Taiwan Normal University, Taiwan  

For Teachers


Code Language Translator Run

Software Requirements


Android iOS Windows MacOS
with best with Chrome Chrome Chrome Chrome
support full-screen? Yes. Chrome/Opera No. Firefox/ Samsung Internet Not yet Yes Yes
cannot work on some mobile browser that don't understand JavaScript such as.....
cannot work on Internet Explorer 9 and below



Fu-Kwun Hwang; Fremont Teng; Loo Kang Wee

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Sample Learning Goals


For Teachers



Combo Box and their Functions

Display will give you checkboxes
while Liquid Density, Object Density and b give sliders.

Draggable Block

You can drag the block vertically in the simulation as well.
The simulation will also be carried out in real-time,
and will auto-play upon release.

Toggling Full Screen

Double clicking anywhere in the panel will toggle full screen.
Only works if the simulation is paused.

Play/Pause, Step and Reset Buttons

Plays/Pauses, steps and resets the simulation respectively.






Other Resources


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