What Forces are at Play on a Rock Sinking at Constant Speed in Water?

[johann1301]

If a rock is sinking in water with constant speed..

how many forces are working on it?

 

[berkeman]

If a rock is sinking in water with constant speed..

how many forces are working on it?

What are *your* thoughts? What is the context of your question?

 

[johann1301]

my thoughts are that there are only two; gravity and water resistance, but my physics book says its three; gravity, water resistance AND buoyancy. i don't understand how buoyancy works in this situation... anyone?

 

[A.T.]

i don't understand how buoyancy works in this situation... anyone?

Do you understand how buoyancy works other situations? It is usually the same:
http://en.wikipedia.org/wiki/Buoyancy#Simplified_model