Most people don't slip and fall on clean, dry and level floors. Slips, trips and falls to the same level also aren't isolated to a particular area of a facility. They can happen anywhere. The good ...

Say we consider a simple experiment of balancing a wooden rod on two fingers. The finger on the left, (1), will remain stationary, whereas the finger on the right, (2), will be moved toward the left.

I learned to respect friction, as a phenomenon with many nuances, when I was a graduate student. One day, while teaching a problem session in elementary mechanics, I unwisely invented a new problem to ...