find the length of a paperclip with each of the three “rulers” ruler a ruler b ruler c 1.were...
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Find the length of a paperclip with each of the three “rulers”
• Ruler a
• Ruler b
• Ruler c
1. Were all of your measurements identical
2. Which measurement required the greatest degree of estimation
3. How do your measurements indicate the difference in degree of estimation>
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Unit 1- Precision and Accuracy
• Accurate- Measurements that are close to the “correct” value – Bull’s eye
• Precise- Measurements that are close to each other.
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Accuracy/Precision video
• Uncertainty in measurement video
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Measurements… actual= 2.4cmStudent A Student B
Trial 1 2.5 cm 1.8cm
Trial 2 2.4 cm 1.7cm
Trial 3 2.3 cm 1.8cm
Average: 2.4cm 1.76cm
1. Were either of the students accurate? Which one? WHY?2. Were either of the students precise? Which one? WHY?3. Were either of the students both accurate and precise? Which one? WHY?
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Uncertainty in measurement
• The last # which you estimate is the ____________• In this case, the uncertain # is _______• Measurements are only as precise as the _________
• When measuring this pin, its about 2.85.
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Uncertainty in measurement
• The last # which you estimate is the UNCERTAIN NUMBER• In this case, the uncertain # is 5• Measurements are only as precise as the device
• When measuring this pin, its about 2.85.
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Units Notes• Units: the scale that goes with numbers
• There are 3 systems: – English – in America (ex. Foot, pound)– Metric- EVERYWHERE (ex. Meter, gram)– SI – for science
• Based on metric
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The Fundamental SI base unitsmeasurement
unit
abbreviation
instrument
picture
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The Fundamental SI base unitsmeasurement Length
unit meter
abbreviation m
instrument ruler
Picture
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The Fundamental SI base unitsmeasurement Length mass
unit meter kilogram
abbreviation m kg
instrument ruler Balance
picture
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The Fundamental SI base unitsmeasurement Length mass volume
unit meter kilogram liter
abbreviation m kg l
instrument ruler Balance Graduated cylinder
picture
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The Fundamental SI base unitsmeasurement Length mass volume temperature
unit meter kilogram
liter Kelvin
abbreviation m kg l K
instrument ruler Balance Graduated cylinder thermometer
picture
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The Fundamental SI base unitsmeasurement Length mass volume temperature time
unit meter kilogram liter Kelvin second
abbreviation m kg l K s
instrument ruler Balance Graduated cylinder
thermometer stopwatch
picture
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Mass• Mass = quantity of matter in an object.
• Weight= force exerted on an object by gravity.