Question

how can two forces of 3N and 4N combine to give forces of 7 N and 1N

Answer 1

If the force acts in the same direction, then the resultant force is added. So if 3N and 4N will act in same direction, then the resultant will be 7N.

If the force acts in opposite directions, then the resultant force is the difference of the two. So if 3N and 4N will work in opposite directions, the resultant will be 1N



Better way to understand :-

→ Consider a block. A 3N force pushes it and a 4N force pushes it from the opposite direction like this :-


→ 3N [] ← 4N

So the resultant is 1 N


Now if both acts in same direction :-

→ 3N [] → 4N

then the resultant would be 7N