I can't believe I am trying to justify the correct answer all over again, 18 months later, one person at a time. This is why I was going to close the thread.
Does that explain it better?
stop explaining it. anyone who doesn't get it after 27 pages of forum discussion deserves their blissful ignorance imo.
Seeing as we're thinking about aeroplanes...
Say we have a type of plane that has a maximum take-off weight of 20,000 kilograms (i.e. it won't take off if it's any heavier).
We load the plane up and it weighs 19,995kg.
Then we add 10kg of live birds in a big cage, making the total weight 20,005kg (exceeding the maximum take-off weight).
If the birds were to start flying inside the cage, would the plane be able to take off?
I want to know if a helicopter on a turntable would fly.