Sir, – Fixed or rotating casters on supermarket trolleys? All I know is that when I insert my €1 coin in the slot I expect the engine to start. – Yours, etc,
JOHN O’BYRNE,
Mount Argus Court,
Harold’s Cross,
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Dublin 6W.
Sir, – Many thanks to Jane Nyhan (July 8th) for her contribution to the shopping trolley debate.
I was, of course, addressing the problem from the perspective of rate of change of angular momentum. I realise now that this is not the full story. As my wife kindly pointed out to me, I have never actually driven one of these things.
I have been directed to perform some experimental work next Saturday, and look forward to publishing my results. – Yours, etc,
ARTHUR HENRY,
Balally Drive,
Dundrum,
Dublin 16.