Discussion :: Physics
- What is the principle of a ''Life Jacket"?
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A.
It provides oxygen to a drowning person |
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B.
It increases the volume of the person to keep him afloat |
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C.
It decreases the volume of the person to keep him afloat |
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D.
The person can sit on it like a raft |
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Answer : Option B
Explanation :
The upward-pushing force that keeps things afloat is called buoyancy. For an object to float it must be able to equal its own weight by displacing enough water. A life jacket is mainly filled with gas which has a very low mass. As such when worn by a person, it acts to significantly increase their volume for only a very small increase in their mass. This means that they have a lower density than normal which increases their buoyancy and helps them to float.
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