lesson 1 precision and significance...

Lesson 1 Precision and Significance 2014.notebook

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May 22, 2014

Measuring Instruments


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May 22, 2014

Are you certain??????

Uncertainty: The amount that a measurement you record could vary from the true measure of an object.


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May 22, 2014

Precision: The smallest scale division on a measuring tool; a finer scale makes it possible to measure with less uncertainty.

How tall are you?

How precise is the measurement?


4

May 22, 2014

Which is an exact value?

1. The mass of a bar of soap is 120 mg.

2. The deck area of a cruise ship is 137 000 m2.

3. A pencil is 127 in long.

4. There are 26 swimmers in a pool.

Ans: #4, you can't have part people, but in all the other situation the value could be rounded off.


5

May 22, 2014

Which measuring instrument gives the most precise results? 1

10001. A digital micrometer that measures to mm

2. A ruler that measures to 1 mm.

116

3. A laser tool that measures to in

10014. A slide micrometer that measures to mm

Ans: #1, the micrometer is broken into smaller pieces than any of the other items so you can have a more accurate measurement.


6

May 22, 2014

What is the smallest unit that you can measure with this ruler with certainty?

18 in1. 1

10 in2. 116in3. 1

4 in4.

Ans: #1, each inch is broken into 8 parts so the smallest unit must be 1/8.


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May 22, 2014


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May 22, 2014

What's significant?

Significant digits: digits that are known with certainty.

What's the deal between Solange and JayZ?

OMG, we're graduating in June!!!

The Montreal Canadiens made it to the next round of playoffs!


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May 22, 2014

A pitcher holds 2.005 L. How many significant digits are in this measurement?

A. 4 B. 2 C. 3 D. 1

Ans: A, count them!


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May 22, 2014

The work triangle in a kitchen is formed between the sink, stove, and refrigerator. Designers recommend that the combined length of the three sides of this triangle should be no more than 8 m. Arlene is designing a kitchen with these lengths:

Stove to refrigerator 1.68 m Refrigerator to sink 1.9 m

Sink to stove 2.21 mHow should Arlene report the combined length of the three sides of this work triangle?

A. 5.7 m B. 5.8 m C. 5 m D. 5.79 m

Ans: B, round the final answer to the same position as the least precise measurement.


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May 22, 2014

Brendyn is installing a round window. The radius of the window is 0.219 m. How should Brendyn report the area of the glass?

A. 0.151 m2

B. 0.1506 m2

C. 0.2 m2

D. 0.15067 m2

Acircle =

Ans: A, when you multiply or divide, round the final answer to the least number of significant digits in the measurements used.


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May 22, 2014

page 40


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May 22, 2014


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May 22, 2014


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May 22, 2014

Pages 38 & 39

Questions 1 6

Pages 42 & 43

Questions 1 8


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May 22, 2014

lesson 1 precision and significance...

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