Before the Bell Rings Collect all handouts. DO NOT TRY TO SOLVE ANY PROBLEMS!!!! Have out bellwork sheet. Be ready to begin when the bell rings. Honors:

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Presentation transcript:

Before the Bell Rings Collect all handouts. DO NOT TRY TO SOLVE ANY PROBLEMS!!!! Have out bellwork sheet. Be ready to begin when the bell rings. Honors: Get a text book.

Bellwork Today, scientists must search through scientific journals before performing an experiment or making methodical observations. Where would this step take place in a diagram of scientific methods? Why? Answer in complete sentences!!

Factor Label Method Please copy down the notes I tell you to copy down. :) Thanks!

Conversion factors Conversion factors for 1 ft = 12 in There are almost an infinite number of conversion factors that include meters:

The steps to follow Now we are ready to solve problems using the factor label method. The steps involved are: 1.Write down the desired quantity/units 2.Equate the desired quantity to given quantity 3.Determine what conversion factors you can use (both universal and question specific) 4.Multiply given quantity by the appropriate conversion factors to eliminate units you don’t want and leave units you do want 5.Complete the math

Factor label example Q - How many kilometers are in 47 miles? (note: 1 km = miles) First write down the desired quantity # km

Q - How many kilometers are in 47 miles? (note: 1 km = miles) Next, equate desired quantity to the given quantity # km= 47 mi Factor label example

Q - How many kilometers are in 47 miles? (note: 1 km = miles) Now we have to choose a conversion factor # km= 47 mi Factor label example

Q - How many kilometers are in 47 miles? (note: 1 km = miles) What conversion factors are possible? # km= 47 mi 1 km mi 1 km Factor label example

Q - How many kilometers are in 47 miles? (note: 1 km = miles) Pick the one that will allow you to cancel out miles # km= 47 mi 1 km mi 1 km Factor label example

Pick the one that will allow you to cancel out miles Q - How many kilometers are in 47 miles? (note: 1 km = miles) # km= 47 mi 1 km mi 1 km Factor label example

Q - How many kilometers are in 47 miles? (note: 1 km = miles) Multiply given quantity by chosen conversion factor # km= 47 mi 1 km mi 1 km Factor label example

Q - How many kilometers are in 47 miles? (note: 1 km = miles) Multiply given quantity by chosen conversion factor # km= 47 mi x 1 km mi Factor label example

Q - How many kilometers are in 47 miles? (note: 1 km = miles) Cross out common factors # km= 47 mi x 1 km mi Factor label example

Q - How many kilometers are in 47 miles? (note: 1 km = miles) Cross out common factors # km= 47 x 1 km Factor label example

Q - How many kilometers are in 47 miles? (note: 1 km = miles) Are the units now correct? # km= 47 x 1 km Factor label example

Q - How many kilometers are in 47 miles? (note: 1 km = miles) Yes. Both sides have km as units. # km= 47 x 1 km Factor label example

Q - How many kilometers are in 47 miles? (note: 1 km = miles) Yes. Both sides have km as units. # km# km = 47 x 1 km # km Factor label example

Q - How many kilometers are in 47 miles? (note: 1 km = miles) Now finish the math. # km= 47 x 1 km = 75.7 km Factor label example

Q - How many kilometers are in 47 miles? (note: 1 km = miles) The final answer is 75.7 km # km= 47 x 1 km = 75.7 km Factor label example