# Is Archimedes principle violative of Newton's 3rd law of motion?

1. Apr 10, 2010

### ankit1

1. When a heaveir body having density more than water, is submerged in water, as per Newton's third law of motion, it experiences an equal & opposite thrust i.e. an upward thrust equal to its weight. Then, the body should have remained afloat, but, we find it sinks. Is it not violative of Newton's 3rd law?
Further, we cannot move a car/bus by our push while sitting/standing inside. But, we can make them move by push from outside.Why?

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2. Apr 10, 2010

### D H

Staff Emeritus
What do you think? The template is there for you, not us, to fill in. We help you do your own homework. We do not do it for you. You need to show some work.

3. Apr 10, 2010

### morphemera

Go back and look at the chapter of the Newton's third law. You should note the point the force vector acting and the answer is obvious.