\begin{table}[h!]
\centering
\begin{tabular}{lllllll}
\rowcolor[HTML]{656565}
{\color[HTML]{FFFFFF} Function} & {\color[HTML]{FFFFFF} Input} & {\color[HTML]{FFFFFF} Output} & \multicolumn{3}{l}{\cellcolor[HTML]{656565}{\color[HTML]{FFFFFF} Physical principle}} & {\color[HTML]{FFFFFF} Embodiment} \\
& & & action reaction & tension & friction & bolt \\
& \multirow{-2}{*}{normal force} & \multirow{-2}{*}{normal force} & action reaction & friction & ... & screw \\
\multirow{-3}{*}{\begin{tabular}[c]{@{}l@{}}connecting\\ parts\end{tabular}} & \begin{tabular}[c]{@{}l@{}}normal force,\\ magnetic fields\end{tabular} & \begin{tabular}[c]{@{}l@{}}normal force,\\ magnetic fields\end{tabular} & magnetism & ... & ... & magnets
\end{tabular}
\end{table}