IMathAS-libretexts

A block of mass $\displaystyle {M}$ is at rest at the bottom of a container full of liquid. Let $\displaystyle {W}$ be the magnitude of the weight of the block, let $\displaystyle {F}_{{B}}$ be the magnitude of the buoyant force on the block, and let $\displaystyle {N}$ be the magnitude of the normal force exerted on the block by the bottom of the container. Which of the following is a correct expression of Newton's second law for the block?

$\displaystyle {M}{a}={W}âˆ’{N}$
$\displaystyle {M}{a}={W}âˆ’{F}_{{B}}$
$\displaystyle {M}{a}={W}âˆ’{N}âˆ’{F}_{{B}}$
$\displaystyle {M}{a}={N}âˆ’{F}_{{B}}$

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