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Subject
Physics
School
University of California Irvine
Type
Homework
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Physics
When I was at the seaside I was trying to take a stone found in the water close to the
coast and to bring with me to the coast. The rock was about 50 cm in diameter and it
was fully under the water. The stone had the shape of a ball. When I tried to raise the
stone it seems to me that it could be easy to bring the stone to the shore. As soon as half
of the stone was outside the water the stone was almost twice as heavy as at the
beginning. I realized that I need help to successfully finish what I wanted so I called my
brother to help me. We left the stone in the plastic swimming pool which was full of the
water. We observed that the part of the water was displaced outside.
Then, I started to think about the physic principle that was behind the problem. I
realized that some force helped me to bring the stone close to the surface water but after
that point, that force was slowly disappeared. I know that gravity makes things to be
pulled to the Earth's center but this force had obviously opposite direction. I managed to
lift the stone to be partly immersed from the water. So, the sum of my force and the
“unknown” force was higher than the gravity force. I figure out that the buoyant force
acting to the object. At the moment when the stone was partly immersed in the water,
the sum of my force and the buoyant force which was applied by the fluid were the
same as the weight of the stone. In the next step, my force stayed the same and the
buoyant force started decreasing so I needed an extra force (my brother) to bring the
stone at the coast. Finally, when we put the stone in the plastic swimming pool (the
stone was fully immersed) a significant amount of water was overflowing. I figure out
that I investigated the Archimedes principle. The principle stated that the buoyant force

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Physics When I was at the seaside I was trying to take a stone found in the water close to the coast and to bring with me to the coast. The rock was about 50 cm in diameter and it was fully under the water. The stone had the shape of a ball. When I tried to raise the stone it seems to me that it could be easy to bring the stone to the shore. As soon as half of the stone was outside the water the stone was almost twice as heavy as at the beginning. I realized that I need help to successfully finish what I wanted so I called my brother to help me. We left the stone in the plastic swimming pool w ...
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