Testing Materials - 2nd Grade Science
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What does it mean to test a material “for a purpose”?
What does it mean to test a material “for a purpose”?
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To check whether it works for a specific job or need. Tests determine if material meets specific requirements.
To check whether it works for a specific job or need. Tests determine if material meets specific requirements.
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Find the length: the object starts at $3$ cm and ends at $10$ cm on a ruler.
Find the length: the object starts at $3$ cm and ends at $10$ cm on a ruler.
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$7$ cm. Subtract start from end: $10-3=7$ cm.
$7$ cm. Subtract start from end: $10-3=7$ cm.
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Find the length: the object starts at $1$ cm and ends at $7$ cm on a ruler.
Find the length: the object starts at $1$ cm and ends at $7$ cm on a ruler.
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$6$ cm. Length equals ending position minus starting position: $7-1=6$.
$6$ cm. Length equals ending position minus starting position: $7-1=6$.
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Identify what you should do if you repeat a test and get different results each time.
Identify what you should do if you repeat a test and get different results each time.
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Repeat more trials and record each result. Multiple trials reveal consistency and identify outliers.
Repeat more trials and record each result. Multiple trials reveal consistency and identify outliers.
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Which property is being tested if a material does not let water pass through?
Which property is being tested if a material does not let water pass through?
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Waterproof (water resistance). Materials that block water are waterproof or water-resistant.
Waterproof (water resistance). Materials that block water are waterproof or water-resistant.
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Which property is being tested if you press a material and it bends easily?
Which property is being tested if you press a material and it bends easily?
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Flexibility. Bending without breaking shows the material can flex.
Flexibility. Bending without breaking shows the material can flex.
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What should you record during a materials test to make your results useful?
What should you record during a materials test to make your results useful?
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Observations and measurements for each trial. Data from each trial helps identify patterns and reliability.
Observations and measurements for each trial. Data from each trial helps identify patterns and reliability.
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Which option best describes a fair test: change one thing or change many things at once?
Which option best describes a fair test: change one thing or change many things at once?
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Change one thing. Testing one variable at a time shows what causes the result.
Change one thing. Testing one variable at a time shows what causes the result.
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Which variable should stay the same to make a fair test?
Which variable should stay the same to make a fair test?
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All conditions except the one thing being tested. Fair tests isolate one variable to test its effect.
All conditions except the one thing being tested. Fair tests isolate one variable to test its effect.
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What is an observation in a materials test?
What is an observation in a materials test?
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A detail noticed using senses (and sometimes tools) during a test. Uses senses or tools to gather information about material properties.
A detail noticed using senses (and sometimes tools) during a test. Uses senses or tools to gather information about material properties.
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What is a measurement in a materials test?
What is a measurement in a materials test?
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A number with a unit found using a tool (for example, cm). Quantifies properties using measuring tools with standard units.
A number with a unit found using a tool (for example, cm). Quantifies properties using measuring tools with standard units.
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Which tool should you use to measure the length of a small object in centimeters?
Which tool should you use to measure the length of a small object in centimeters?
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A ruler marked in centimeters. Rulers have centimeter markings for precise small measurements.
A ruler marked in centimeters. Rulers have centimeter markings for precise small measurements.
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Which unit is most appropriate for measuring the length of a pencil: centimeters or meters?
Which unit is most appropriate for measuring the length of a pencil: centimeters or meters?
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Centimeters. Pencils are typically 10-20 cm long, making cm the appropriate unit.
Centimeters. Pencils are typically 10-20 cm long, making cm the appropriate unit.
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Identify the correct first step when testing a material for a purpose.
Identify the correct first step when testing a material for a purpose.
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State the purpose or question the test must answer. Clear purpose guides what to test and measure.
State the purpose or question the test must answer. Clear purpose guides what to test and measure.
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What is the best way to organize observations and measurements from several materials?
What is the best way to organize observations and measurements from several materials?
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A data table with material names and results. Tables organize data for easy comparison between materials.
A data table with material names and results. Tables organize data for easy comparison between materials.
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