Chapter 1.2 Review

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Chapter 1.2 Review
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1. How can numerous measurements be taken in
science when there are only seven fundamental
units of measure?
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The fundamental units can be combined to form
derived units.
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2. Why is the metric system called the MKS system?
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Because the most commonly used units are meter,
kilogram, and second.
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3. List the basic measurements in physics and
tell how they are measured.
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meter the distance light travels in a tiny
fraction of a second.kilogram the mass of the
standard kilogram (the only measure that is still
a natural object)second a certain number of
vibrations of a cesium-133 atom
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4. How is the metric system based on liquid water?
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1 ml 1 cm3 1 gram of liquid water1 calorie
raises the temperature of 1 g of liquid water 1
degree celsius
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5. What is the difference in accuracy and
precision?
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Accuracy is how close a measurement is to the
right answer. Precision is how repeatable the
measurement is.
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6. Why is relative error a more meaningful
measurement than absolute error?
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Because it is a percentage of the correct value.
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7. If measurements arent precise, what does that
tell you about the measurements?
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There is some flaw in the way the experiment is
being done.
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8. Give an example of a situation where numbers
are not significant.
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If you told someone that 500,000 people live in
Denton county you dont man exactly 500,000. Most
of those zeros are not significant.
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9. What is the most important step in problem
solving and why?
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Check your answer for reasonableness. Because
you dont want to look foolish. More importantly,
it will cause you to look back and correct your
answer.
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