1. Warm UP  How many seconds are there in a day?  How many total pins are knocked down if you bowl a turkey (3 strikes)?  How many pennies would you need to have 6 dollars total?

2. Unit Conversion Factor

3. How many seconds are there in a day?  First assess what you know: There are 60 seconds in a minute There are 60 minutes in an hour There are 24 hours in a day  Cancel Units and Solve the Problem: 60 seconds x 60 minutes x 24 hours 1 minute1 hour1 day = 86400 seconds 1 day

4. Important Notes  In dimensional analysis we use a line to separate two things that are equal 1 day = 24 hours IS THE SAME AS… _1 day__OR24 hours 24 hours 1 day  We multiply numbers on the top and divide by any numbers on the bottom (BUT UNITS MUST BE CORRECT IN THE ANSWER!!!)  Units are very important, you will lose points if you forget them!

5. For Example In the previous problem… 60 seconds x 60 minutes x 24 hours 1 minute1 hour1 day (60 x 60 x 24) = 86,400 s/day

6. How many total pins are knocked down if you bowl a turkey?  First assess what you know: There are 10 pins knocked down in a strike There are 3 strikes in a turkey  Then write out the problem and cancel units: 1 Strike x 1 Turkey = 1 Turkey 10 pins 3 Strikes30 pins  Is this the answer you want? No – Invert your answer  ANSWER: 30 Pins knocked down/Turkey

7. How many pennies would you need to have 6 dollars total?  First assess what you know: There are 100 pennies in a dollar You need 6 dollars  Then write out the problem and cancel units: 100 pennies x 6 dollars = 600 pennies 1 dollar

8. Let’s Practice…  A new drug has a dosage of 2.3 mL for every 1 pound of patient’s body weight. If you have a patient who weights 198 lbs, how much drug should you give them?

9. Show Your Work! 2.3 mLX 198 lbs = 1 lb Pounds cancel out and we are left with: 2.3 mL X 198 = 455.4 mL

10. One More Important One…  If the STEELERS beat the Cowboys this season by three touchdowns (including extra points) and three field goals, how many total points will the Steelers WIN by?

11. Show Your Work:  First assess what you know: There are 7 points per touchdown There are 3 total touchdowns There are also 3 field goals There are 3 points per field goal  Then write out the problem and cancel units: 7 points x 3 touchdowns = 21 points 1 touchdown 3 points x 3 field goals = 9 points 1 field goal 21 points + 9 points = 30 points

12. SI Units:  Length  Volume  Mass  Temperature  Time  Pressure  Energy  Amount of a Substance  Luminous Intensity  Electric Current  Meters (m)  Liters (L)  Kilograms (kg)  Kelvin (K)  Seconds (s)  Pascals (Pa)  Joules (J)  Moles (mol)  Candela (cd)  Ampere (A)