Competition of two pencils. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Competition of two pencils. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

Take two faceted pencils and hold them in front of you parallel, putting a ruler on them. Start bringing the pencils closer together. Rapprochement will occur in successive movements: first one pencil moves, then the other. Even if you want to interfere with their movement, you will not succeed. They will still move forward.

Competition of two pencils

Why is this happening? As soon as there is more pressure on one pencil and the friction has increased so much that the pencil cannot move any further, it stops.

But the second pencil can now move under the ruler. But after a while, the pressure above it also becomes greater than above the first pencil, and due to increased friction, it stops. And now the first pencil can move. So, moving in turn, the pencils will meet in the very middle of the ruler at its center of gravity. This is easy to verify by the divisions of the ruler.

This experiment can also be done with a stick, holding it on outstretched fingers. As you move your fingers, you will notice that they, also moving alternately, will meet under the very middle of the stick. True, this is only a special case. Try doing the same with a regular broom, shovel, or rake. You will see that the fingers will not meet in the middle of the stick.

Author: Rabiza F.V.

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