[tex]\displaystyle Se~da:\\ \\
m=4kg\\ \\
F=10N\\ \\
g=10\frac m{s^2}\\ \\
\mu=0,1\\ \\ \\
Formule:\\ \\
Conform~legii~doi~a~lui~Newton:\\ \\
F=m\times a,~de~unde:\\ \\
F+F_{fr}=m\times a\\ \\ \\[/tex]
[tex]\displaystyle Pe~axa~O_y:\\ \\
N+G=0\\ \\
N=G\\ \\
N=m\times g\\ \\ \\
Pe~axa~O_x:\\ \\
F-F_{fr}=m\times a\\ \\
F-\mu\times N=m\times a\\ \\
F-\mu\times m\times g=m\times a\\ \\
a=\frac{F-\mu\times m\times g}{m}\\ \\ \\
Calcule:\\ \\
a=\frac{10-0,1\times 4\times 10}{4}=1,5\frac {m}{s^2}[/tex]