Wording of this Handout:
Suppose you were riding your bicycle along a flat, straight road when you caught up with your friend who was also riding a bicycle the same way.
If you tied a rope to your friend's bicycle and pulled him along, would it take more energy or less energy to move the two bicycles?
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Science puzzle answer
Less energy, because even though you would be pedalling harder, your friend would not be pedalling, so he would not be using as much energy as before. You are obviously an Noddy for towing your friend and a first class Dodo for tying rope to a bicycle in a public road!