Elastic coins. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Elastic coins. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

For this experience, pick up a few identical coins, such as nickels. They must be straight and not bent. Put two of them on the table at some distance from one another. Now sharply click on one penny so that it slides on the table and hits another. If you hit exactly, head-on, then the first nickel will stop almost immediately, and the second will bounce and, as it were, continue the movement of the first.

Focus secret:

Why did it happen? Because of elasticity. Hitting one against the other, both coins are compressed at the first moment. But elasticity tends to restore their original shape. The force of elasticity "pushes" the colliding coins in opposite directions. Therefore, the first coin to hit gets its hit back and stops. And the second coin bounces and continues the movement of the first.

The experiment can be complicated by laying several coins on the table in a row on the same line so that they touch one another. What happens if you hit another coin on the last coin of the row? The hitting coin will stop dead in its tracks. Her push will be transmitted throughout the row. One by one, the coins will compress and then decompress again. In this case, each struck coin will receive its push back, and each struck coin will transmit it further. And only the very last coin in the series will have nothing to transmit a push and nothing to receive it back from. Therefore, it, unclenching, will push off from the penultimate coin and bounce off!

This experiment can be done with checkers. Hold the last checker in the row from above with your finger and hit the edge with a wooden ruler. A checker will bounce from the other end, and always only one.

The same experiments can be done with billiard or croquet balls. Only in all cases you need to hit exactly, "head to head." With an oblique strike, the hitting coin or ball does not stop, but only deviates to the side and slows down its movement. And the hit body bounces at an angle to the side.

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