physics basics science measurements and units. measurements measurements consist of a number and a...
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PHYSICS BASICS
Science Measurements and Units
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MEASUREMENTS
Measurements consist of a number and a unit.
Example
100 meters
the number of units
the unit
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INTERNATIONAL SYSTEM OF UNITS (SI units) Developed for the sake of
consistency ease of understanding sharing data
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BASE SI UNITS (standard units)
Measured quantity
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DERIVED UNITS
Derived Units: Combinations of the 7 base units.
Examples Area (length x width) m x m = m2
Velocity (distance/time) = m/s
10 meters
5 meters50 m2
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How to Measure? Know how to operate the measuring
instrument Which unit(s) is represented? What does each tick mark represent? Are there multiple scales? Did you zero out the instrument (if possible)
Be skilled and patient enough to measure with the greatest detail possible
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What do the tick marks represent on a meter stick? What unit is represented by the
smallest tick mark on the meter stick?
m?
dm?
cm?
mm? *
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What do the tick marks represent on a meter stick? What is the measurement?
In mm?
65 mm
In cm?
6.5 cm
In dm?
.65 dm
In m?
0.065 m?
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ACCURACY
Accuracy is the extent to which a measurement approaches the true value.
Your Time:
2:05 pm
Actual Time:
2:10 pm
Your accuracy is off by 5 minutes
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- The bull’s eye represents the true value.- The darts represent three separate measurements
accurate
less accurate
these darts show good accuracy
which paint ball mark is more accurate?
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PRECISION
Precision is the degree of exactness of a measurement.
Based on the scale of the measuring instrument.
Smallest tick marks represent millimeters (mm)
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PRECISION VS. ACCURACY
A—Good precision and accuracy
B—Some accuracy and poor precision
C—Good precision and poor accuracy
D—Poor precision and accuracy
A B C D
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Discussion Question When shooting free throws, is it
better to be precise or accurate?
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It’s better to be accurate.