My middle school physics teacher taught us to build those formulas by reverse-engineering the units. This was before we had done enough algebra to know what we'

My middle school physics teacher taught us to build those formulas by reverse-engineering the units. This was before we had done enough algebra to know what we're doing so we used triangle diagrams, but boy was it the best thing I ever learned. Don't understand what something is? Just look at the unit. It tells you!