Today’s maths mentoring
required dredging up more physics, this time the calculation of forces, energy,
work and power, which I used to enjoy doing on the basis the words meant something
and the concepts could be visualised quite readily, however with the “s.i.”
units (new-fangled things when I was a lad) now completely replacing the old
imperial units it took a moment or two before I could relate newtons, joules
and even watts to good old pounds force, foot-pounds and horsepower, and even
longer to work out that under this terminology weight (being a force) is
measured in newtons not kilograms (which measure mass not weight); confusing - but so were the old days when pounds were both
used as (different) units for mass and force.
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