Materials Required:
l 4 small plastic bowls
l Strong plastic tape
l 16 marbles
l 3-foot, or longer, board
l Several books
Procedure:
- Tape 2 small plastic bowls together back to back, forming a wheel. Make another wheel with 2 more identical bowls.
- Tape 4 marbles to the center of each side of one wheel. Then tape 4 marbles to each side of the other wheel, but place 2 marbles close to the inside rim and 2 marbles directly opposite.
- Prop up the end of a board with several books. Hold both wheels at the high end.
- Release the wheels at the same instant. The wheel with the weights in the center will speed ahead of its opponent. Can you explain why?
