Explain why 5N + 4N does not always mean a resultant force of 9N
(answer in simple, please since I am not that deep into physics)
Answers
Answer:
There are 2 forces acting on an object. One is 5 Newtons and the other is 4 Newtons.
But we don't know how they are acting, right?
Like, they could be perpendicular to each other.
Or they could be parallel
they could act in different directions.
and they could also act in the same direction.
And many more conditions.
Unless and until the forces act in the same direction can we say that the total force is 9N. Otherwise we can't use one condition and say it is universally true.
Hope this helps you.
Answer:
Force is a vector quantity. That means it requires direction.
So, there are possibly infinite positions that both the forces can take. For example - The both the forces can be in opposite direction, and maybe perpendicular, or in an acute angle is formed with the other force. So, when forces are added, Vector Addition is used.
That is R (resultant)
R = √(A² + B² + ABcosθ)
A is vector 1 and B is vector 2
Nothing to deal with derivation, atleast for now. Just by-heart the equation. The equation came, because force require to mention the direction to add up