Find the length of a paperclip with each of the three “rulers”

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Presentation transcript:

Find the length of a paperclip with each of the three “rulers” Ruler a Ruler b Ruler c Were all of your measurements identical Which measurement required the greatest degree of estimation How do your measurements indicate the difference in degree of estimation>

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.

Accuracy/Precision video Uncertainty in measurement video

Measurements… actual= 2.4cm Student A Student B Trial 1 2.5 cm 1.8cm Trial 2 2.4 cm 1.7cm Trial 3 2.3 cm 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?

Uncertainty in measurement When measuring this pin, its about 2.85. The last # which you estimate is the ____________ In this case, the uncertain # is _______ Measurements are only as precise as the _________

Uncertainty in measurement When measuring this pin, its about 2.85. The last # which you estimate is the UNCERTAIN NUMBER In this case, the uncertain # is 5 Measurements are only as precise as the device

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

The Fundamental SI base units measurement unit abbreviation instrument picture

The Fundamental SI base units measurement Length unit meter abbreviation m instrument ruler Picture

The Fundamental SI base units measurement Length mass unit meter kilogram abbreviation m kg instrument ruler Balance picture

The Fundamental SI base units measurement Length mass volume unit meter kilogram liter abbreviation m kg l instrument ruler Balance Graduated cylinder picture

The Fundamental SI base units measurement Length mass volume temperature unit meter kilogram liter Kelvin abbreviation m kg l K instrument ruler Balance Graduated cylinder thermometer picture

The Fundamental SI base units measurement 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

Mass Mass = quantity of matter in an object. Weight= force exerted on an object by gravity.