Obtain 5 pennies. Line up 3 pennies touching in a perfect line. Line up 2 more pennies touching each other in perfect line with the other 3 pennies. Leave some space between the groups of pennies. Place your fingers onto the 2 slider pennies. Slide the 2 pennies into the group of 3. This may take practice to slide them correctly. Record what happens to the pennies after collision.

Two other pennies will be launched, resting only 3 pennies left.

Explanation:

Take "o" as a pennie.

ooo    oo

ooo ← oo

oo ← ooo

The process is very similar to what occurs with the pendulum of newton by the law or principle of energy conservation.

In physics, the law or principle of energy conservation states that the total amount of energy in an isolated system remains constant. Such a principle is closely linked to the very definition of energy. An informal way of enunciating this law is to say that energy cannot be created or destroyed: energy can only be transformed from one type to another. The energy from the two pennies will be transferred to the other two pennies from the edge, the energy is then transformed into a kinetic move again.

answer: electrons