Question

An ox is being made to drag a box of socks. there is 920N of friction between the box and the floor, the box has a mass of 350kg. the ox is pulling with a force of 1200N right. draw a free body diagram showing the forces relevant to the motion of the box and calculate the acceleration.

Answer 1

Let's draw a FBD:

Let's apply the Newton's Second Law of Motion in $x$-direction :

$$F_{pull}-F_{fr}=ma,$$ $$a=\dfrac{F_{pull}-F{fr}}{m},$$ $$a=\dfrac{1200\ N-920\ N}{350\ kg}=0.8\ \dfrac{m}{s^2}.$$

Answer:

$a=0.8\ \dfrac{m}{s^2}.$