Question

question 9
1 pts
a sled has the following horizontal forces:
force magnitude direction
pull (rope) 7 n right
push (helper) 4 n right
friction (snow) 8 n left
what is the net force on the sled?
19 n right
11 n left
3 n right
3 n left

Explanation:

Step1: Define right - direction as positive

Let forces acting to the right be positive and to the left be negative.

Step2: Calculate the sum of forces

The pull force $F_{pull}=7N$ (positive), the push force $F_{push}=4N$ (positive) and the friction force $F_{friction}=- 8N$ (negative). The net force $F_{net}=F_{pull}+F_{push}+F_{friction}$.
$F_{net}=7 + 4+( - 8)$
$F_{net}=7 + 4-8$
$F_{net}=3N$
Since the result is positive, the direction is to the right.

Answer:

3 N right