3 A box of mass 5 kg is at rest on a rough horizontal floor.
- Find the value of the normal reaction of the floor on the box.
The box remains at rest on the floor when a force of 10 N is applied to it at an angle of \(40 ^ { \circ }\) to the upward vertical, as shown in Fig. 3.
\begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{52d6c914-b204-4587-a82e-fbab6693fcf8-2_293_472_2131_794}
\captionsetup{labelformat=empty}
\caption{Fig. 3}
\end{figure} - Draw a diagram showing all the forces acting on the box.
- Calculate the new value of the normal reaction of the floor on the box and also the frictional force.