Gyroscope

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Recommends Berello · 2021-08 · Physics Stack Exchange · on “Can the fish topple the bowl?”

Yes, the fish can topple the bowl, exploiting friction. You can find robots based on gyroscopes that can topple their case, like the Cubli (you can find a video here [LINK] ). They can do that from the inside of the case, without external moving parts. The box could even be closed and opaque, hiding the "magic" behind it: it would still work. [LINK] That would be very difficult to do for a fish, but you said your fish is strong enough, thus it could hypothetically push a large amount of water and make it spin very fast inside the bowl; the friction between the high-speed water and the glass of the bowl will make the bowl rotate, too. About the other question (whether the center of mass can m

Cites Nick · 2013-09 · Physics Stack Exchange · on “Is a spinning object heavier than a non-spinning object?”

As in the answer of @Mark Eichenlaub the mass of the lawnmower won't increase! Of course the blades of the lawnmower can have a pull-effect in which they might aid your foreward-movement (in which degree this might help, I'm not sure ...). Of course a rotating blade creates an angular momentum, so if you were to make a turn with your lawnmower you'll need some extra force to change this momentum. So I'd say that turning would be harder! Also if your lawn is uneven, your lawnmower might tilt which will of course also change your angular momentum, this might make it harder to go in a foreward direction! So yes spinning can make an object heavier (in the sense that you'll need to apply a bigger

Cites Kosta Butbaia · 2016-09 · Physics Stack Exchange · on “Why does a spinning top get back upright when knocked?”

This is called gyroscopic effect and it states that An object that is spinning has an angular momentum $\vec{L}$ Thus it tends to remain its axis of rotation, $\vec{L}=I\omega$ faster it spins (greater $\omega$) more it tends to remain its axis of rotation. Consider an image bellow, A spinning top is rotating with an angular velocity $\omega$, Therefore it has an angular momentum $\vec{L}$, Faster it spins greater the $\vec{L}$ and more it tends to remain its rotational motion about a certain axis, Note that when it slows down (Due to frictional forces) it has smaller $\vec{L}$ Thus its precession increases due to its weight pulling it down. ( A Gyroscopic effect demonstration video [this video]

Cites Cort Ammon · 2019-03 · Physics Stack Exchange · on “A spinning pendulum”

The spinning will cause the sphere to exhibit gyroscopic effects [this video] . Thus the sphere will not always rest at the same angle that the non-spinning one will. This will have the same effect as shortening the string slightly (because the center of gravity of the ball no longer goes quite so far down at the bottom of the pendulum). This will make the period shorter. If you had a massless sphere, or a point source mass, this effect would not occur.