measurements. units unit- what we measure something in example – 32 feet – 85 seconds – 0.004...

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Page 1: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Measurements

Page 2: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Units

• Unit- what we measure something in• Example

– 32 feet– 85 seconds– 0.004 lbs– 98.6˚F– 0.6 m

Units

Page 3: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Check yourself

• Which of the following are units?

feet

temperature

meters

length

milestime

hours

kilograms

dollars

Page 4: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

SI Units

• What scientists (and almost everybody else) uses

Our Units (what we use)

SI Units (what everyone else uses)

Length Feet (ft) Meters (m)

Time Seconds (s) Seconds (s)

Weight (how much gravity pulls us down)

Pounds (lbs) Newtons (N)

Mass (how much stuff there is in an object)

---------------------------------------

Kilograms (kg)

Page 5: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Measuring length

• Meter stick• Larger than a meter stick

– 1000 meter sticks= 1 km

• Smaller than a meter stick– 1 meter= 100 cm– Even smaller

• 1 meter= 1000 mm

Page 6: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

• Joe owns his own company

• He needs 1200 gold pieces just this length for his new invention

Page 7: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

He does a quick measurement and writes down the length as 3.5 cm.

His: 3.5 cm Real: 3.42 cm Difference of 0.08 cm

Page 8: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Oops!

• His quick measurement: 3.5 cm• Real: 3.42 cm• Difference of 0.08 cm• If he orders 1200 pieces, each 3.5 cm….• 96 extra cm• 5 dollars an inch? = $188.98• Measuring properly is important!

Page 9: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Measuring• You can guess one

number.

12

34

56

78

910

Page 10: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Measuring

• You can guess one number.

• 7.6 cm

12

34

56

78

910

Page 11: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

• Try measuring here

Page 12: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

• Try measuring here:2.37 cm

Page 13: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Measuring Length correctly

• You get to guess one number.

Page 14: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

How about this one?

Page 15: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Page 16: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

MASS

• How much stuff an object has• NOT how much an object weighs• Mass is measured in kilograms (kg).

Page 17: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Triple Beam Balance

Page 18: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Page 19: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Metric Conversions

Page 20: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Memorize this

• In order to make metric conversions we need to know our conversion factors.

• We will need to memorize our conversion factors for metrics.

• We can do this with the following pneumonic device:

King Henry Died Monday drinking chocolate milk

Page 21: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

What does that mean?

King Henry Died Monday drinking chocolate milk

Kilo Hecto Deca Meter deci centi mili

NOTICE THAT THE WORDS AFTER METER ARE NOT CAPITALIZED!!!!

Page 22: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Sample Problem

23 cm = ____?____ Dm

We will use stair steps to make our conversions

Page 23: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

K

H

D

M

d

c

m

Page 24: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Sample Problem

23 cm = ____?____ Dm

Page 25: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

K

H

D

M

d

c

m

23 cm = ____?____ Dm

1. Put a decimal in front of the number if there isn’t one already. 23. cm2. Find the starting point.3. Count the number of steps to get to the ending point.

1

2

3

Page 26: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Sample Problem

• Move the decimal that many places over

23. 0.023

Answer

23 cm = 0.023 Dm

Page 27: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Another sample

• 7.8 Km = ____?______dm

Page 28: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

• 7.8 Km = 78000 dm

Page 29: Measurements. Units Unit- what we measure something in Example – 32 feet – 85 seconds – 0.004 lbs – 98.6˚F – 0.6 m Units

Now you try

1. 14 mm = ___________M2. 2.1 Hm =___________cm3. 92 M =_____________Km4. 5.22 Dm =__________dm5. 0.45 Km = __________mm

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