Momentul fortei:
[tex]\text{Momentul Fortei = M} = F \cdot b_f\text{, unde F = forta, }b_f=\text{bratul fortei}[/tex]
[tex][\text{M}]_{SI} = [F]_{SI} \cdot [b_f\text{ (distanta)}]_{SI} \implies [\text{M}]_{SI}=N\cdot m[/tex]
Lucru mecanic:
[tex]L = F \cdot d \cdot \cos\alpha \implies [L]_{SI} = [F]_{SI} \cdot [d]_{SI} = N \cdot m = J \text{ (Joule)}[/tex]
Forta de Greutate:
[tex]G = mg \implies [G]_{SI} = [m]_{SI} \cdot [g]_{SI} = kg \cdot \frac{N}{kg} = N \text{ (Newton)}[/tex]
Forta de frecare:
[tex]F = \mu \cdot N \implies [F]_{SI} = N \text{ (Newton)}[/tex]
Toate fortele au aceeasi unitate de masura, Newton-ul.
Energie:
[tex]E_c = \frac{mv^2}{2}, [E_c]_{SI} = J \text{ (Joule)}[/tex]
[tex]E_p = m\cdot g\cdot h, [E_p]_{SI} = kg\cdot \frac{N}{kg} \cdot m = J \text{ (Joule)}[/tex]
