ch2 balance lab

BALANCE LAB 

PURPOSE:  learn to use the balance and, calculate % error, and find the pattern in the pennies.

PROCEDURE:

1.    watch mechanical balance demo 

put hangar on top hook,  move all riders to 0.

should be perfectly balanced, now add object,

first move riders, then turn dial until perfectly balanced.

124.75g

2.    mass flask, old penny, new penny on the mechanical balance

3.    mass objects on the electronic balance

5.    calculate % error for the new penny ( experimental - accepted)/accepted * 100)  ( use electronic balance for accepted flask mass;  consult US mint for penny accepted value)

6.    make sure you can read both types of balances; reading the dial balance;     reading 4 beam balance; 

7. record  data on google form.  Look at the class data to answer the question, 'what is the pattern in the pennies?' (Be specific!  Hint: Look for a pattern in  the masses and the years)

8. record volume of water in small and large graduate (note station)

9. read temperature of the room on thermometer (by smartboard or in yellow tray at station 2)