But First - Review For each of the following experiments, state whether the variable mentioned is...
Transcript of But First - Review For each of the following experiments, state whether the variable mentioned is...
Measurements
But First - ReviewFor each of the following experiments, state whether
the variable mentioned is the independent variable, dependent variable, or control variable.
Jeremy wants to see if the amount of Wheaties he eats in the morning affects the number of points he makes in that day’s basketball game. While he changes the amount of Wheaties, he keeps using the same amount of milk.
Amount of Wheaties
Independent Variable
But First - ReviewFor each of the following experiments, state whether
the variable mentioned is the independent variable, dependent variable, or control variable.
Jeremy wants to see if the amount of Wheaties he eats in the morning affects the number of points he makes in that day’s basketball game. While he changes the amount of Wheaties, he keeps using the same amount of milk.
Number of points
Dependent Variable
But First - ReviewFor each of the following experiments, state whether
the variable mentioned is the independent variable, dependent variable, or control variable.
Jeremy wants to see if the amount of Wheaties he eats in the morning affects the number of points he makes in that day’s basketball game. While he changes the amount of Wheaties, he keeps using the same amount of milk.
Amount of Milk
Control Variable
But First - ReviewFor each of the following experiments, state whether
the variable mentioned is the independent variable, dependent variable, or control variable.
Christina wants to test whether the “smart pills” she recently ordered from the internet will actually improve her grades. She tries to keep the rest of her diet the same.
Her grades
Dependent Variable
But First - ReviewFor each of the following experiments, state whether
the variable mentioned is the independent variable, dependent variable, or control variable.
Christina wants to test whether the “smart pills” she recently ordered from the internet will actually improve her grades. She tries to keep the rest of her diet the same.
Smart pills
Independent Variable
But First - ReviewFor each of the following experiments, state whether
the variable mentioned is the independent variable, dependent variable, or control variable.
Christina wants to test whether the “smart pills” she recently ordered from the internet will actually improve her grades. She tries to keep the rest of her diet the same.
Rest of her diet
Control Variable
But First - ReviewFor each of the following experiments, state whether
the variable mentioned is the independent variable, dependent variable, or control variable.
Julia wants to see if the amount of water she gives her plant will affect its growth. She keeps the amount of sunlight the plant receives constant.
The plant’s growth
Dependent variable
But First - ReviewFor each of the following experiments, state whether
the variable mentioned is the independent variable, dependent variable, or control variable.
Julia wants to see if the amount of water she gives her plant will affect its growth. She keeps the amount of sunlight the plant receives constant.
Amount of sunlight
Control Variable
But First - ReviewFor each of the following experiments, state whether
the variable mentioned is the independent variable, dependent variable, or control variable.
University researchers are studying whether or not a student has breakfast every day affects his/her state test scores. During the study, they keep the number of students they are studying the same.
The number of students
Control Variable
But First - ReviewFor each of the following experiments, state whether
the variable mentioned is the independent variable, dependent variable, or control variable.
University researchers are studying whether or not a student has breakfast every day affects his/her state test scores. During the study, they keep the number of students they are studying the same.
Whether a student has breakfast
Independent Variable
What is a Measurement?Measurement – describes a physical
quantity with a number AND a unit
Common MeasurementsQuantityWhat it measures
Metric
UnitTool used to measure it
Length
A distance
Meters (m)
Meter stick, ruler
Mass
How much matter there isGrams (g)
Balance
VolumeAmount of space taken up by matterLiters (L)
Graduated Cylinder
Measuring Mass1. Put weighing
container on balance.
2. Zero the balance.3. Fill container with
matter.4. Read balance. Do
NOT round.
Measuring Volume1. At eye level, look at
the surface level of the liquid.
2. Measure at the bottom of the meniscus, or curve.
3. Watch the lines! (Be careful when figuring out how many mL each line represents!)
Each line in this graduated cylinder is 1 mL
Measuring Volume1. At eye level, look at
the surface level of the liquid.
2. Measure at the bottom of the meniscus, or curve.
3. Watch the lines! (Be careful when figuring out how many mL each line represents!)
Each line in this graduated cylinder is 0.2 mL
Accuracy, Precision, Percent ErrorAccuracy – how close a measurement is to
the actual value
Precision – how exact your measuring tool is(usually has more numbers)
Accuracy, Precision, Percent ErrorPercent Error – shows how accurate a
measurement isSmaller Percent Error = More Accurate
Example 1
Which trial has the most EXACT measurement?
Trial 3 is the most precise
Which trial has the smallest percent error?Trial 2 is the most accurate
Example 2The actual volume of a 2 Liter bottle of soda is 2
L. However, when I measure the amount of liquid inside, I measure 1.9L. What is my percent error?
Actual Value: 2LYour Value: 1.9L
Measurements Activity
Read all directions CAREFULLY!!
Measurements Independent Practice
Let me know if you have any questions!!
Unit 1 Vocabulary ReviewHypothesis Theory Law
Independent Variable Dependent Variable
Control Variable Model
Quantitative Data Qualitative Data
Graduated Cylinder Balance
Grams (g) Meters (m) Liters (L)
Accuracy Precision Percent Error