I love using free fall to demonstrate the connection between acceleration, velocity, and displacement. I think students can not only get a good feel for the concept of gravitational acceleration, but just acceleration in general. This worksheet uses basic calculations to find the displacement, velocity, and acceleration for an object in free fall every second for 15 seconds, then tasks the students with graphing each as a function of time. From the graphs they can easily see and analyze the relationship between acceleration, velocity, and displacement.
If you have the ability to do so, I like to split up the calculations and have the students each submit their response to a live Google form, where we can then compile and share their individual calculations. From there I can graph their submitted responses in Excel where we can easily see and correct any calculation errors.