How to activate another script?

[system]

Hello, this is a basic question, but if I want to have a trigger (button, collision, etc.) to activate another script, how would I do that? How would I limit the amount of time the script would be activate? An example would be: The player hits a button and a "constant force" script is activated for 5 seconds (to simulate nitrous oxide in a car). Thanks.

[Atnas1010]

Would it be something like this you are looking for?

function Update ()
{
    if (Input.GetKey(KeyCode.Space) && nosReady)
        NOS();
}

function NOS()
{
    nosReady = false;
    nosActive = true;
    yield WaitForSeconds(5);
    nosActive = false;
    yield WaitForSeconds(5);
    nosReady=true;
}

function FixedUpdate()
{
    if (nosActive)
    {
        //Add force
    }
}