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Physics behind pop up toys

I received a pop-ups popper toy (a rubber toy in the shape of a a dome). I noticed that when I load the popper on my finger, it launches a farther distance than if I load it on a table top. I thought the popper used a suction technique, but then I was confused as to why the popper went farther when loaded on my finger when there was little suction between the popper and my finger. Thanks!

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Question from Rotational Dynamics

Dyana Asked:

A small rubber wheel is used to drive a large pottery wheel. The two wheels are mounted so that their circular edges touch. The small wheel has a radius of 3.5 cm and accelerates at the rate of 7.9 rad/s^2, and it is in contact with the pottery wheel (radius 23.0 cm) without slipping.
a)Calculate the angular acceleration of the pottery wheel
b)Calculate the time it takes the pottery wheel to reach its required speed  of  64 rpm

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