Yanci

Cleaning Pennies Part 2

Today at science we did two experiments.  Our first experiment was on the force of friction.  Our second experiment was called Part 2.

First we did an experiment on dirty pennies that were in a stack.  We hit the bottom pennies with a butter knife.  The penny went flying off.  Then we made a bigger tower.  The first time we hit it, it fell down because it doesn’t have that much friction.  But when the tower is smaller, it has much more friction.

Next we cleaned the dirty pennies.  We cleaned the pennies with coffee and vinegar.  We put one cup of coffee in one jar with pennies in it.  In a different cup we put pennies in vinegar.  Then we closed the jar.  Now we have to wait 3 days.  I can’t wait see them.