1. Obtain 5 equal-sized coins and that table with the smooth top.
2. Line up 3 coins touching each other in a perfect line.
3. Line up 2 more coins touching each other in perfect line with the other 3. There should be a 5-cm gap between the groups of marbles.
4. Place your fingers onto the two slider coins. Slide the two coins into the group of 3. Be sure that the two slider coins stay in contact with each other when they collide with the group of 3. This may take practice to slide them correctly.
5. Record what happens to the groups of coins after collision. (repeat several
times for best results.)
6. Repeat the collision several more times with different combinations of sliders.
7. Record your observation!