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DIFFICULTY OF THE IMPERIAL UNITS?

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One inch is usually divided into 8, 10 or 16 parts: DIFFICULTY OF THE IMPERIAL UNITS This particular ruler has 16 divisions

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One inch is usually divided into 8, 10 or 16 parts: DIFFICULTY OF THE IMPERIAL UNITS So, the smallest division = 1/16 th of an inch

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One inch is usually divided into 8, 10 or 16 parts: What is the length of the pencil? So, the smallest division = 1/16 th of an inch

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One inch is usually divided into 8, 10 or 16 parts: What is the length of the pencil?

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Videoclip

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1.3 Relating SI and Imperial Units Copyright © 2010 Ryan P. Murphy

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Gallon Mph (Miles per hour) Pounds Inches Yards Fahrenheit I will show you these 6 pictures showing you their metric values.

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One gallon of milk = 3.78 liters of milk

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65 mph = 104 km/h Copyright © 2010 Ryan P. Murphy

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Double Quarter Pounder(0.5 pound) = kg

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48 inches tall = 1.22 meters tall Copyright © 2010 Ryan P. Murphy

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1 Yards = meters Copyright © 2010 Ryan P. Murphy

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80 degrees Fahrenheit = 26.7 degrees Celsius Copyright © 2010 Ryan P. Murphy

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The International System (System Internationale ‘unites) of Units (SI) also known as THE METRIC SYSTEM.

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It is used by scientists all over the world

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The Metric System : A measurement system based on the powers of ten. Copyright © 2010 Ryan P. Murphy

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POWERS OF TEN HAVE PREFIXES Copyright © 2010 Ryan P. Murphy

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YOU MUST KNOW THEM!!! Copyright © 2010 Ryan P. Murphy

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The simplicity of the Metric System? Copyright © 2010 Ryan P. Murphy For example: LENGTH: meter MASS: gram VOLUME: liter Only one unit of measurement for each quantity

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You can measure the very small and the very large with the same unit Copyright © 2010 Ryan P. Murphy

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The measurements below are all the same. Copyright © 2010 Ryan P. Murphy “I am mm tall.” “I am cm tall.” “I am meters tall.” “I am km tall.” Compare it with Imperial System

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The simplicity of the Metric System? Copyright © 2010 Ryan P. Murphy SI For example: LENGTH: meter MASS: gram VOLUME: liter Only one unit of measurement for each quantity For example: LENGTH : mile, yard, foot/feet, inch… MASS : grain (≈0.65g), drachm (1.77 g), pound (453 g)… VOLUME : ounce (0.028 L), gill (0.142 L), gallon (4.55 L)… Imperial

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a number and unit Any quantity we measure,( length, mass, volume… ) consists of a number and unit If we are given a quantity in one type of unit, and we want another type of unit : We must convert the units We can do this using :We can do this using 2 methods:

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A relationships between any quantities can be expressed by CONVERSION FACTORS

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EXAMPLE #1 Convert 21.5 inches to cm!

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conversion factors Step 1: Write conversion factors for inches and cm cancel units Step 2: Choose a conversion factor which will allow you to cancel units of a given quantity ( inches in our case) cancel check Step 3: Multiply, cancel and check the units EXAMPLE #1 Convert 21.5 inches to cm!

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conversion factors Step 1: Write conversion factors for inches and cm Convert 21.5 inches to cm!

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conversion factors Step 1: Write conversion factors for inches and cm Convert 21.5 inches to cm! cancel units Step 2: Choose a conversion factor which will allow you to cancel units of a given quantity ( inches in our case)

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Convert 21.5 inches to cm! 21.5 inches x cancel check Step 3: Multiply, cancel and check the units

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EXAMPLE #1 Convert 21.5 inches to cm!

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A Canadian football field is approximately 59 m wide. What is this measurement to the nearest foot? Use both of the methods of conversion.

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Nora knows that she is 5 ft. 7 in. tall. a) What height in centimetres will she list on her driver’s license application? Use both of the methods of conversion.

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HOMEWORK O Pages : 22 – 23 O Problems : 4 – 14 (all even)

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Convert 6.32 µm to km 1.Convert to a base unit (need 2 conversion factors) and from the base unit

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Convert 6.32 µm to km 3. Insert the values for 1 µm and 1 km

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Convert 6.32 µm to km 4.Cancel the units and do the math

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