Cameras work by snapping a tiny fraction of what you see through the lens, which can be as quick as a thousandth of a second! The faster the shutter speed, the more you are going to 'freeze' a moment in time. A slow shutter speed, such as 1/20th of a second can show motion blur, or your moving subject may be blurred completely.
If you're using a fast shutter speed, then you'll need to adjust some of the other settings too, in order to provide enough light for the sensors to capture the image. There's lots to think about!
For this challenge we'll be looking for photographs where the action has been captured in sharp focus, with very little or no motion blur. Techniques such as panning could be experimented with too.
Remember to also consider your composition to frame chosen action well.
Entries opened on Friday 23rd January, and will close on Thursday 8th March at 11.59pm AEST.
To enter (it's free!) you can do one of the following:
Post your photo on the Photoh Facebook wall stating your city. Once on the Facebook page, you'll just need to scroll down to the 'Visitor Posts' tab on the right, and add your own.