Many students were captivated by the grandeur of the Rio Olympics. I picked a couple events that were ongoing when I needed to make this worksheet for a substitute teacher.
It was made as practice for both speed and dimensional analysis for students who had been exposed to both already - NOT as an introduction to those topics.
We had just completed a "Walking speed lab" where students measured their own speed walking, speed walking, walking backward, etc. and we were able to compare the speeds in the Olympics to their speeds from the lab. For example, Michael Phelps swims faster than most of my students speed walk..Usain Bolt traverses the length of my classroom in one second (on average!) during his 100m dash.
You could show some of these races from videos on YouTube, as well, if desired!