Hot issues：
This module collects the frequently encountered and difficult problems for reference only.
This module collects the frequently encountered and difficult problems for reference only.
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质量为3kg的水受到的重力多大?
因为物体受到的重力与质量成正比，受到的重力G与质量m的关系式为： G=mg
所以，m=3kg的水受到的重力G为：
\begin{align}
G=&mg\\
=&3kg \times 9.8N/kg\\
=&29.4N
\end{align}
即，3kg的水受到的重力为29.4N