Spin faster by going smaller! 🌀 #DrTatiana #science #funny #shorts

You can try this demonstration yourself using a spinning stool (or office chair) and two small weights to explore the power of conservation of angular momentum. You start by spinning slowly with arms stretched out to the sides. But when the weights are pulled close to the body, the spinning suddenly speeds up.

This happens because, when no outside torques are acting, an object’s angular momentum stays the same. But the angular momentum is a product of the rotational velocity and rotational inertia which is basically how the weight is spread out. Changing it—arms wide versus arms close—affects how fast the body spins. Pulling the arms in makes you spin faster to conserve angular momentum. It’s the same principle figure skaters use when they pull their arms in to spin faster. To feel it, you need to be on ice, or on a rotating stool with low friction, or floating in space!

This was presented by Dr. Tatiana Erukhimova, professor at Texas A&M University @tamu.

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