Obedient ball. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Obedient ball. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

This is a fairly well-known toy, but I want to remind you of it, because it is based on a physical phenomenon - friction.

You are holding a vertically stretched string in your hands. A ball is put on the lace (usually it is a wooden ball). The ball is at the top of the lace. According to your "orders" the ball then falls, then stops. Obediently fulfilling all your commands, he descends to the lower hand.

It's all about friction here. The channel in the ball, through which the lace is passed, is not straight, but curved, it is drilled in an arc. When the string is taut, it is pressed harder against the wall of the channel and friction keeps the ball from sliding down. It only takes a little, imperceptibly to the eye, to loosen the tension - and the ball will slide down under the influence of gravity until you pull the cord again.

obedient ball

That's the whole secret of this toy.

If you want to make such a toy yourself, take a table tennis ball and make four small holes in it: two at the ends of one diameter, the other two at the ends of a second diameter perpendicular to the first.

Insert a match into two (opposite each other) drilled holes and cut off the ends protruding from the ball with a safety razor blade. Thread a thin cord through the other two holes with a wire. It should not fit tightly into the holes. When the string is pulled, it will go around the inserted match and will keep the ball from sliding down. When the tension is loosened, the ball can easily fall.

This toy can also be made from a cylindrical box. If its diameter is larger than a match, use a thin stick. It is convenient to use a cardboard box for this toy. It can be pasted over with paper so that the ends of the inserted stick are not visible.

Author: Rabiza F.V.

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