18. what is the resultant force? a) none of the above b) 11n, left c) 17 n, left d) 6n, right 19. what is…

18. what is the resultant force? a) none of the above b) 11n, left c) 17 n, left d) 6n, right 19. what is the net force? a) 5.5 n right b) 5.5 n left c) 2.5 n left d) 2.5 n right

18. what is the resultant force? a) none of the above b) 11n, left c) 17 n, left d) 6n, right 19. what is the net force? a) 5.5 n right b) 5.5 n left c) 2.5 n left d) 2.5 n right

Answer

Explanation:

Step1: Define left - direction as negative and right - direction as positive for 18th question

The forces acting on the block are $F_1=- 12N$ (left - acting 12N force), $F_2=-5N$ (left - acting 5N force) and $F_3 = 6N$ (right - acting 6N force).

Step2: Calculate the resultant force for 18th question

The resultant force $F_{resultant}=F_1 + F_2+F_3=-12 - 5+6=-11N$. The negative sign indicates the direction is to the left. So the resultant force is 11N to the left.

Step3: Define directions for 19th question

Let the right - direction be positive and the left - direction be negative. The forces acting on the car are $F_4 = 4.0N$ (right - acting) and $F_5=-1.5N$ (left - acting).

Step4: Calculate the net force for 19th question

The net force $F_{net}=F_4+F_5=4.0+( - 1.5)=2.5N$. The positive sign indicates the direction is to the right.

Answer:

  1. b) 11N, Left
  2. d) 2.5N right