And finally...thinking laterally
[Acknowledgement: ‘Thinking Physics’, author L.C. Epstein ]
Here is a problem which illustrates the final guideline [Guideline 0.11].
Consider the two bikers shown in the figure. They start 20 miles apart and cycle steadily towards one another, each moving at 10 mph. Meanwhile a bee goes back and forth between them, flying at 25mph.
The question: how far does the bee travel before it is ruthlessly squashed between the bikers?
You can make this quite difficult. Or you can make it easy by looking from a different angle....