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| Wall-Climbing Machine
When Harvey Screwbrain invented his wall-climbing machine, everyone
thought it wouldn't work. They were right! Quite simply, there was nothing
to hold the machine onto the wall. But how much of a screwbrain was
Harvey? Did he at least manage to get the wheels that were in contact with
the wall (A and B) to turn the right way? The inside of the machine is shown
above with pulleys (black) and cogs (white).
Which way do wheels A and B rotate?
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Answer:
Wheels A and B both turn anti-clockwise. So Harvey wasn't so screwy after all!
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