Nikon f3 shutter speed dial won't click?

I don't know if i forced it on accident but the shutter speed dial won't click when i turn it. And also if you put it on the B setting which normally holds it open as long as you are holding the button. (as you probably already know) it just takes a photo in a fraction of a second and i assume its a fast setting because i took a picture of an apple free falling and i haven't developed it yet but i didn't miss any of it falling.

please help my photography teacher is not being to helpful and when i tried to show her she said i was just wasting film.
oh and i have a project due tomorrow and i need to finish this roll of film with some blurred shots

Added (1). It doesn't click when i change settings and it isn't the right settings on which ever one it says its on

Are you saying that when you move the shutter speed dial from 1/1000th second to 1/500th second, you no longer feel the little detente at each shutter speed? That can mean something that could cost you a lot of money to correct.

As far as shooting an apple falling, this is the technique you need to use.

The technique is called "High Speed Photography" This technique has been used for decades, long before digital cameras were even a thought

If you want to see a blur of the apple falling and then freeze it before it falls out of the frame, you need to use what is called rear curtain flash setting.

With your camera on a tripod in the vertical position, light the place where the apple will be falling. You can use the same black background. You want the exposure to be about 1/2 second, giving you time to release the apple well out of the camera frame and timed so that the apple is toward the bottom as the shutter closes and flash goes off. Since you did not tell us if you were shooting in black and white or colour, I will assume you are using black and white and are developing it yourself in class. To get this right, you may have to shoot two rolls of 36 exposure film.