Variables and Failure Points - 3rd Grade Science
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What is the dependent variable?
What is the dependent variable?
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The variable that is measured or observed. This shows the effect of changing the independent variable.
The variable that is measured or observed. This shows the effect of changing the independent variable.
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What are controlled variables (constants) in an experiment?
What are controlled variables (constants) in an experiment?
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Factors kept the same in every trial. Keeping these constant ensures only one thing affects results.
Factors kept the same in every trial. Keeping these constant ensures only one thing affects results.
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Which option best describes a fair test?
Which option best describes a fair test?
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Only one variable is changed at a time. This ensures results are due to the tested variable only.
Only one variable is changed at a time. This ensures results are due to the tested variable only.
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What is a trial in an experiment?
What is a trial in an experiment?
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One repetition of an experiment. Multiple trials help verify results are consistent.
One repetition of an experiment. Multiple trials help verify results are consistent.
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Which option best reduces failure points: repeating trials or doing only one trial?
Which option best reduces failure points: repeating trials or doing only one trial?
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Repeating trials. Multiple trials reveal and reduce random errors.
Repeating trials. Multiple trials reveal and reduce random errors.
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Identify the variable mistake: A student changes water amount and pot size in the same experiment.
Identify the variable mistake: A student changes water amount and pot size in the same experiment.
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Two independent variables were changed. Can't tell which variable caused the results.
Two independent variables were changed. Can't tell which variable caused the results.
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Identify the controlled variable: A student tests paper towel brands and keeps spill size the same.
Identify the controlled variable: A student tests paper towel brands and keeps spill size the same.
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Spill size (amount of water). Same water amount ensures fair towel comparison.
Spill size (amount of water). Same water amount ensures fair towel comparison.
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Identify the failure point: One plant is placed near a cold window while others are not.
Identify the failure point: One plant is placed near a cold window while others are not.
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Temperature/location was not kept the same. Different temperatures affect growth unfairly.
Temperature/location was not kept the same. Different temperatures affect growth unfairly.
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Identify the failure point: A student writes results from memory instead of recording them right away.
Identify the failure point: A student writes results from memory instead of recording them right away.
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Not recording data immediately. Memory errors lead to incorrect data in the experiment.
Not recording data immediately. Memory errors lead to incorrect data in the experiment.
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Identify the failure point: A student forgets to reset a timer to $0$ before each trial.
Identify the failure point: A student forgets to reset a timer to $0$ before each trial.
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Timer not reset to $0$ each trial. Previous time adds to new measurement, giving wrong results.
Timer not reset to $0$ each trial. Previous time adds to new measurement, giving wrong results.
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Identify the failure point: A student sometimes reads the thermometer from the side, not eye level.
Identify the failure point: A student sometimes reads the thermometer from the side, not eye level.
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Incorrect thermometer reading (not at eye level). Side angles distort the true temperature reading.
Incorrect thermometer reading (not at eye level). Side angles distort the true temperature reading.
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Which option is a common failure point: measuring with different tools each time or using one tool?
Which option is a common failure point: measuring with different tools each time or using one tool?
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Measuring with different tools each time. Different tools give different measurements, causing errors.
Measuring with different tools each time. Different tools give different measurements, causing errors.
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What is a failure point in an experiment?
What is a failure point in an experiment?
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A place where an error can cause wrong results. Errors at these points make experiment results unreliable.
A place where an error can cause wrong results. Errors at these points make experiment results unreliable.
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Identify the dependent variable: A student changes water amount and counts leaves on each plant.
Identify the dependent variable: A student changes water amount and counts leaves on each plant.
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Number of leaves. Leaf count changes based on water amount given.
Number of leaves. Leaf count changes based on water amount given.
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Identify the independent variable: A student changes water amount and counts leaves on each plant.
Identify the independent variable: A student changes water amount and counts leaves on each plant.
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Amount of water. The student controls how much water to give.
Amount of water. The student controls how much water to give.
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