Physics doesn't always come in the form of books. It also comes in the form of toys.
So, I came across this fascinating toy that spins two minutes straight when given a spin. I got a chance to use it, but couldn't figure out where to thrust it. Every point that I tried on gave the impression that there was a better position somewhere else. From then, I have been left thinking,
Where to thrust the spinner, so as to make it attain the maximum angular velocity possible ?
I appreciate any ideas, but if we could project an answer supported by experimental data and mathematics for this, it would be great!
Here are some positions that I have tried spinning it:
Near the center of the iron armor:
The spinner attained the maximum velocity fast, so I guess it is very near to our answer.
Near the neck of the spinner:
Great force had to be applied, but the speed attained was fairly large.
Along the side of the limbs of the spinner:
Less force needed to be applied, but no appreciable increment in velocity.
(More creative methods are welcome!!)
Now the force needn't always be tangential as I had shown above.
You can think of changing the angle of line of action of the force, too.