DIFFICULTY OF THE IMPERIAL UNITS?. One inch is usually divided into 8, 10 or 16 parts: DIFFICULTY OF...
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Transcript of DIFFICULTY OF THE IMPERIAL UNITS?. One inch is usually divided into 8, 10 or 16 parts: DIFFICULTY OF...
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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
![Page 3: DIFFICULTY OF THE IMPERIAL UNITS?. One inch is usually divided into 8, 10 or 16 parts: DIFFICULTY OF THE IMPERIAL UNITS This particular ruler has 16 divisions.](https://reader036.fdocuments.us/reader036/viewer/2022081514/551b0af555034607418b4faa/html5/thumbnails/3.jpg)
One inch is usually divided into 8, 10 or 16 parts:
DIFFICULTY OF THE IMPERIAL UNITS
So, the smallest division = 1/16th 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 = 1/16th 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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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. MurphyCopyright © 2010 Ryan P. Murphy
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Double Quarter Pounder(0.5 pound) = 0.226 kg
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48 inches tall = 1.22 meters tall
Copyright © 2010 Ryan P. MurphyCopyright © 2010 Ryan P. Murphy
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1 Yards = 0.914 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
meter
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The measurements below are all the same.
Copyright © 2010 Ryan P. Murphy
“I am 1828.80 mm tall.”“I am 182.80 cm tall.”“I am 1.8280 meters tall.”
“I am .001828 km tall.”
Compare it with Imperial System
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The simplicity of the Metric System?
Copyright © 2010 Ryan P. Murphy
SIFor example:LENGTH:meter
MASS: gram
VOLUME: literOnly 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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Dimensional Analysis and Conversion factors
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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 :
22.2 m
22.2 m = ? ft
We must convert the units
• We can do this using 2 methods:
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OR
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A relationships between any quantities can be expressed by
CONVERSION FACTORS
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A relationships between any quantities can be expressed by
CONVERSION FACTORS
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EXAMPLE #1Convert 21.5 inches to cm!
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Step 1: Write conversion factors for inches and cm
Step 2: Choose a conversion factor which will allow you to cancel units of a given quantity (inches in our case)
Step 3: Multiply, cancel and check the units
EXAMPLE #1Convert 21.5 inches to cm!
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Step 1: Write conversion factors for inches and cm
Convert 21.5 inches to cm!
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Step 1: Write conversion factors for inches and cm
Convert 21.5 inches to cm!
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!
𝟏 𝒊𝒏𝒄𝒉𝟐 .𝟓𝟒𝒄𝒎
21.5 inches x
𝟐 .𝟓𝟒𝒄𝒎𝟏 𝒊𝒏𝒄𝒉
21.5 inches x
NO!
YES!
Step 3: Multiply, cancel and check the units
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EXAMPLE #1Convert 21.5 inches to cm!
1 step metric conversion
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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.
a) 192 ft. a) 192 ft.
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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.
a) 170 cm
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HOMEWORKOPages: 22 – 23
OProblems: 4 – 14 (all even)
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Convert 6.32 µm to km1. Convert to a base
unit (need 2 conversion factors) and from the base unit
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Convert 6.32 µm to km3. Insert the values for
1 µm and 1 km
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Convert 6.32 µm to km4. Cancel the units and
do the math