In cazul 1, forta de frecare trebuie sa fie compensata de forta elastica:
[tex]F_f=F_e\\ \mu_1 N=k\Delta l_1\ \ \ \ \ \Rightarrow \ \ \ \ \ \dfrac{k}{N}=\dfrac{\mu_1}{\Delta l_1}.[/tex]
In al doilea caz, e la fel:
[tex]\mu_2N=k\Delta l_2\ \ \ \ \ \Rightarrow \ \ \ \ \mu_2=\dfrac{k}{N}\Delta l_2=\dfrac{\mu_1}{\Delta l_1}\Delta l_2=...calcule[/tex]
Spor la calculat
