Question

An applied force of 50N is used to accelerate an object with a weight of 80N to the right across a frictional (with friction) surface. The object encounters 10 N of friction. Fill in the blanks below, finding what’s called for.

FN=___

Ff=____

Fapp=___

Fg=_____

m=___

Fnet=___

accerleration= ___

Answer 1

(a) $F_N=80\ N.$

(b) $F_{fr}=10\ N.$

(c) $F_{app}=50\ N.$

(d) $F_g=80\ N.$

(e) $m=\dfrac{F_g}{g}=\dfrac{80\ N}{9.8\ \dfrac{m}{s^2}}=8.16\ kg.$

(f) $F_{net}=F_{app}-F_{fr}=50\ N-10\ N=40\ N.$

(g) $a=\dfrac{F_{net}}{m}=\dfrac{40\ N}{8.16\ kg}=4.9\ \dfrac{m}{s^2}.$