Why Does the Hammer
Balance on the Edge of the Table?
All objects have a center of gravity that acts as if all the weight of the
object were balanced there. The center of gravity of the ruler is in the
middle, but the hammer moves the center of gravity of the system to under the table's edge which keeps it from falling.
How? Place a short candle,
a slightly taller candle, and a small dish or small glass filled with baking
soda in the bottom of a large bowl. Light both candles. Then pour vinegar into
the dish of baking soda. Observe the foaming reaction. What happens to the
candles? Why?
1. What extinguishes the
candles?
When
vinegar reacts with baking soda, carbon dioxide gas is produced. This gas is
heavier than air so it sinks to the bottom of the bowl and slowly begins to
fill up the bowl as though it were water. When the level of carbon dioxide has
risen to the level of the flame, the flame will go out from lack of air.
Materials Needed:
·
Soda
Can
·
Rubber
band
·
Helper
What to do
1.
Ask
someone to stand on a soda can
2.
It
should not be crushed
3.
Hit
it with a rubber band
4.
What
happens?