Essential Questions How do I convert from one unit to another?

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Presentation transcript:

Essential Questions How do I convert from one unit to another? How do I determine the appropriate units for a situation?

Discussion Give some units of measurements for… Length – Weight (Mass) – Time – Minutes Seconds Hours Weeks Year Decade Fortnight Yards Miles Feet Meters Miles Kilometer Furlongs Hands Pounds Ounces Grams Kilogram Ton Kiloton

Example 1 How many seconds are in a week? How many seconds in a minute? How many minutes in an hour? How many hours in a day? How many days in a week? 60 seconds 60 minutes 24 hours 7 days 60 x 60 x 24 x 7 = 604,800 seconds

Discussion Question When we convert units, do we change the value of the number we started with? Why or why not?

Steps for Converting Units Identify the given quantity and the requested quantity (number and units). Identify a conversion path with a set of conversion equalities between the given units and the requested units, possibly converting to intermediate unit if direct conversions are not known. Multiply the given quantity by one or more conversion factors which cancel units that are not wanted in the result, and introduce units that are, until the units of the requested quantity are obtained.

Examples 402.34 meters 25,200 mph $0.25 per 1 pint Example 1 How many meters are in the 440-yard dash? *(1 in = 2.54 cm, 1 yd = 36 in, and 1 m = 100 cm) Example 2 Escape velocity from the earth’s surface is about 7.0 mi/sec. What is that in mi/hr? (Escape velocity = speed it takes to break free from the gravitational pull of Earth) Example3 What is the cost of a glass of milk, assumed to be 1 pint, if milk is sold at $2.00/gal? (1 gal = 8 pints) 402.34 meters 25,200 mph $0.25 per 1 pint

Complete all of the problems on the back of the notes! Classwork/Homework Complete all of the problems on the back of the notes!