QUICK ANSWER
"Esfuerzo" is a form of "esfuerzo", a noun which is often translated as "effort". "Fuerza" is a form of "fuerza", a noun which is often translated as "strength". Learn more about the difference between "esfuerzo" and "fuerza" below.
el esfuerzo(
ehs
-
fwehr
-
soh
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. effort
Estamos haciendo un gran esfuerzo para defender nuestro país.We are making a big effort to defend our country.
2. (physics)
a. force
¿Cuánto esfuerzo se necesita para que esta máquina funcione?How much force is needed to make this machine work?
a. stress
La fuerza de la gravedad exige mucho esfuerzo sobre los edificios altos.The force of gravity exerts a lot of stress on tall buildings.
la fuerza(
fwehr
-
sah
)A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
a. strength
A mi hermano y a mí nos tomó toda la fuerza levantar la caja.It took all of my brother's and my strength to lift the box.
a. strength
Han demostrado mucha fuerza para enfrentar tantos problemas.They have shown a lot of strength in facing all of these problems.
a. force
La policía desalojó a los manifestantes por la fuerza.The police removed the demonstrators by force.
4. (power)
a. strength
La fuerza de su argumento convenció a su jefe a darle un aumento de salario.The strength of his argument convinced his boss to give him a raise.
5. (military)
a. force
La fuerza de ocupación cometió muchas atrocidades.The occupying force committed many atrocities.
