Nikon D3000 fast shooting

I have a nikon D3000 and i want to take pictures of fast moving objects, i have the camera on manual mode and have the shutter speed up around 100, i tried changing the aperture but it only let me go down to 3.5 but every picture comes out black!
i need fast help because i need to take these pictures by tomorrow

Added (1). I'm just using the lens it came with… I'm trying to shoot water falling, the lighting is quite bright.

and whoever the second answer was from, i'm sorry i know 'nothing' about the camera but i'm only 16 and this is for my class so i'm still learning actually

Added (2). Thanks for your help, i know what to do for next time, i've added more lighting and reduced the shutter speed a bit to 1/60 and it has worked better, i will keep these tips in mind for my next shoot
ps, havnt had time to look through all the manual yet because i have other work to do

Well, you clearly do not have any idea how a DSLR camera works. Instead of using manual mode, use the aperture priority mode, and set the lens aperture to the lowest number.

After you get done shooting today, read a good book about DSLR photography to learn how to control exposure in manual mode. I highly recommend a book called "Understanding Exposure."

A black picture means insufficient light.

Change the iso to 1600, open the aperture, see what shutterspeed you can set.

Alternatively, play dumb and use the sports preset.

Well what lens are you using what hows the lighting conditions…
since you can only go to 3.5 i suspect its the lens kit 18-55

so more info on what you are trying to shoot

are you going for motion blur or stop motion

i would go about 1/5
iso of 200
f/22

it will give it a nice flowing look

Your camera can shoot at speeds up to 1/4000th second, however, you can capture action at shutter speeds as slow as 1/500th

The fact that your shots are so grossly underexposed shows that you are NOT using the light meter before you take your shots.

If you are NOT shooting in bright sun, you are going to have to increase the ISO until you can shoot at high shutter speeds in the actual lighting you are attempting the water falling.

What YOU may consider bright light, may have noting to do with how a cameras sensor sees it.

Do this. In bright sun, set the cameras exposure to 1/ISO @ f/16. That should give you a perfect exposure. Then aim the camera at the falling water and see what the light meter tells you.

If you are shooting in the shade, you will have to open up the lens two or three stops or to f/8 or f/5.6 to get a good exposure.

You really, really have to learn how to use the light meter. Being only 16 really has NOTHING to do with using a camera or not. What is important is reading the user manual and getting some experience using the camera to the point where you can nail the exposure every time you press the shutter release.

Look on page 6, 69, 70 and especially 71

And on page 27 to see how to hold the camera securely to prevent camera movement during the exposure