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Sinking rock

by johann1301
Tags: rock, sinking
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johann1301
#1
Jan11-14, 03:21 PM
P: 147
If a rock is sinking in water with constant speed..

how many forces are working on it?
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berkeman
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Jan11-14, 05:12 PM
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Quote Quote by johann1301 View Post
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
#3
Jan12-14, 08:00 AM
P: 147
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.
#4
Jan12-14, 09:13 AM
P: 3,927
Sinking rock

Quote Quote by johann1301 View Post
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


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