Question

look a the free - body diagram below and determine the net force acting upon the object.
$f_{norm}=3n$
$f_{frict}=5n$
$f_{app}=5n$
$f_{grav}=3n$
a zero
b 5 n, east
c 3 n, south
d 6 newtons

Explanation:

Step1: Analyze vertical forces

The normal force $F_{norm}=3N$ acts upwards and the gravitational force $F_{grav}=3N$ acts downwards. The net - vertical force $F_{net - vert}=F_{norm}-F_{grav}=3 - 3=0N$.

Step2: Analyze horizontal forces

The applied force $F_{app}=5N$ acts to the right (assume right - direction as positive) and the frictional force $F_{frict}=5N$ acts to the left. The net - horizontal force $F_{net - hor}=F_{app}-F_{frict}=5 - 5=0N$.

Step3: Calculate net force

The net force $F_{net}=\sqrt{F_{net - hor}^2+F_{net - vert}^2}=\sqrt{0^2 + 0^2}=0N$.

Answer:

A. Zero