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Hello @Tyro
Let me tag @Dave-1 to make sure he's aware of your question. When cutting timber panels and they are supported underneath with your sawhorse several things could happen as your blade cuts through the timber. If the cut piece is unsupported it acts like a timber vice and begins to pinch the blade of the circular saw.
You'll start to get a strong burning smell from the timber when this sometimes happens. This is because the blade is rubbing against the cut timber at high-speed causing it to heat up. That's why you'll sometimes see burn marks on your cut timber.
If the cut piece is long and heavy, it will even sometimes stop the saw in mid cut, and you'll be wondering why it has stopped. The technique to avoid this phenomenon is to place another support on the cut piece. Another way to do it is to place a wedge at the start of your cut so that it forces the cut panels apart thereby removing any stress on the saw blade.
There are a few other methods, but the ones I've mentioned are the most common ones used. You'll be more aware of this situation when you begin using your circular saw.
If you have any other questions we can help with, please let us know.
Eric
Morning @Tyro
I will try and remember to take some meausurments this weekend. I might even make a table.... But shall see 
The boxes are the horses, The Pink is a piece of Timber. What I mean by cutting after the last horse is to have the timber cut after the last horse and not cut before. The weight of the saw will flex the timber and make for a rough cut or even jam. If there is a long offcut then the same applies have a horse support the length but cut near the previous horse so there is no flex in the timber. Too many times my brain goes "Its only one easy cut" only to end up with a mess or some sort of issue because I didnt take the time to reposition the horses.
Dave
Morning @Tyro
I just saw @EricL @ response and yeah he describes it well. When starting out sometimes descriptions seem to make no sense. After you start using or even placing tools/build all of a suddern it goes "click" and you go "Thats what it meant!" Canmt wait to hear your eureka moment!
Will see if I can set up my saws and take a couple of pics this weekend to show.
Dave
hahahaha mmmmm a quick scribble on a post-it note and the horses arnt even the same size but was too lazy to redraw
Thanks tho
Dave
