Question

why needle sink in water but a big ship float

Answer 1

$\textbf{Answer:}$

It is based on $\textbf{Archimedes Principle.}$

➡ It states that when a body is partially or fully immersed in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it.

➠ The iron nail sinks as it is solid and compact with less volume in water and it's density is greater than water, therefore, the upthrust exerted by the water is less than the weight of the nail. This causes it to $\textbf{sink.}$

➠ An iron ship floats as it is hollow and has more volume in water and it's density is less than water, thus the upthrust exerted by the water on the ship is greater than the weight of the ship, making it $\textbf{float.}$

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Answer 2

$\textbf{Question :-}$

♧ Why needle sink in water but a big ship float ?

$\textbf{Answer :-}$

♧ The needle sink in water while a big ship float due to $\textbf{buoyancy}$.

=> Buoyancy states that ,

$\textbf{Upward force}$ = $\textbf{weight of the liquid displaced}$ by the object.

□ $\textbf{Archimedes Principal}$ states that when a body totally or fully immersed in a fluid that that experiences an upthrust force that is equal to the weight of the fluid displaced.

=> Now the reason is cleared ,

□ An iron nail sinks due to the weight of the water displaced by iron nail is less than that of its weight which makes iron nail sinks.

□ A big ship float because the weight of displaced by the ship is equal to its weight that makes the ship float.



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