As mentioned in the last tutorial notes, you can manipulate blocks with Laplace representations easily.
The diagram below shows how the feedback block, H, gets incorporated with block G
...to create the transfer function from x(s) to y(s):
This is a very simple but very useful relationship. We have derived transfer functions using similar techniques in class (just rearranging all the variables until you get "y(s)/x(s)" alone on the lefthand side. Make sure you can walk through this type of simple algebra...
Here's a familiar relationship between torque, inertia and friction - put into block format:
