Experience with unstable balance. Fun physical experience at home

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Experience with unstable balance. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Recall the condition of stable equilibrium: the equilibrium will be stable if the center of gravity is below the fulcrum and exactly below it. This means that if the plumb line passes through the fulcrum or suspension point and through the center of gravity, one can already hope that the balance will be ensured.

Experience with unstable balance

A ball that lies on the table will always be in a state of equilibrium, because its center of gravity (and it is in the center of the ball) will be connected to the fulcrum by a plumb line, no matter how we move the ball. Such an equilibrium is called indifferent. Another thing is if you want the ball to be held on your fingertip. And although such an equilibrium will be very unstable, it still turns out that it is possible. After all, not only jugglers in the circus easily hold large balls on the tip of their fingers, but also animals: trained sea lions, for example, hold the ball on the tip of their nose. And you can learn to hold a big ball at your fingertip. The whole secret is to quickly move the fulcrum - your finger - under the center of gravity of the ball.

As soon as the ball starts to fall, it will move off the plumb line connecting its center to the fulcrum. Immediately you need to straighten the position - bring the fulcrum under the center of the ball. At first, of course, you will not succeed, but after training you will gradually achieve success. And your quick movements to restore balance will hardly be noticeable from the outside. It will seem to the audience that the ball is calmly resting on your finger, not even about to fall. Experiment with balls of different sizes and think about why the experiment with a large ball works best.

Author: Rabiza F.V.

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