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Review of Scientific Variables. Identify the variables in each of the following examples. A scientist was trying to see if the amount of water a plant.

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Presentation on theme: "Review of Scientific Variables. Identify the variables in each of the following examples. A scientist was trying to see if the amount of water a plant."— Presentation transcript:

1 Review of Scientific Variables

2 Identify the variables in each of the following examples. A scientist was trying to see if the amount of water a plant gets affects plant growth. She collected 10 identical plants and gave them different amounts of water. She measured their growth daily. The plants received the same amount of sunlight. 1.What is the manipulated variable in the above investigation? A.Plant growth B.Amount of sunlight C.Amount of water D.10 plants

3 Review of Scientific Variables Identify the variables in each of the following examples. A scientist was trying to see if the amount of water a plant gets affects plant growth. She collected 10 identical plants and gave them different amounts of water. She measured their growth daily. The plants received the same amount of sunlight. 2. What is the responding variable? A.Amount of sunlight B.Plant growth C.Growth measured daily D.The method used to measure the plants

4 Review of Scientific Variables Identify the variables in each of the following examples. A scientist was trying to see if the amount of water a plant gets affects plant growth. She collected 10 identical plants and gave them different amounts of water. She measured their growth daily. The plants received the same amount of sunlight. 3. What are the controlled variables? A.Amount of sunlight B.10 identical plants C.Amount of water D.Both A and B

5 Review of Scientific Variables Identify the manipulated and responding variable(s) in each question from the information given. Then, think of at least two controlled variables that could be set for each experiment. 4. Does the shape of a container affect how fast water will evaporate form it? Manipulated variable: __________________________ Responding variable: __________________________ Controlled variable 1: __________________________ Controlled variable 2: __________________________ Shape of container Rate of evaporation Volume / temperature of water Time measurement is taken

6 Review of Scientific Variables Identify the manipulated and responding variable(s) in each question from the information given. Then, think of at least two controlled variables that could be set for each experiment. 5. How does the distance from a flashlight to a screen affect the size of the illuminated area? Manipulated variable: __________________________ Responding variable: __________________________ Controlled variable 1: __________________________ Controlled variable 2: __________________________ Distance of flashlight to screen Size of illuminated area Same flashlight for each distance Same method of measuring area

7 Review of Scientific Variables Identify the manipulated and responding variable(s) in each question from the information given. Then, think of at least two controlled variables that could be set for each experiment. 6. How does the weight of a parachute load affect how fast it will fall? Manipulated variable: __________________________ Responding variable: __________________________ Controlled variable 1: __________________________ Controlled variable 2: __________________________ Weight of parachute load Rate of fall Area of open chute Height at which load was dropped

8 Review of Scientific Variables Identify the manipulated and responding variable(s) in each question from the information given. 7. Scientists were trying to determine if junk food would cause a mouse to gain weight. The diet of mice was varied. Some mice were given junk food. Others were given Mouse Chow. The mice were weighed daily. All mice were the same sex, the same age, and the same species. Manipulated variable: __________________________ Responding variable: __________________________ Controlled variable 1: __________________________ Controlled variable 2: __________________________ Type of diet Weight of mouse measured daily Same age and species of mouse Same sex, time of measurement

9 Review of Scientific Variables Identify the manipulated and responding variable(s) in each question from the information given. Then, think of at least two controlled variables that could be set for each experiment. 8. How does the amount of fertilizer a farmer uses affect the number of beans he harvests? Manipulated variable: __________________________ Responding variable: __________________________ Controlled variable 1: __________________________ Controlled variable 2: __________________________ Amount of fertilizer Number of beans harvested Same amount of water, sunshine Same type of soil, fertilizer

10 Review of Scientific Variables Identify the manipulated and responding variable(s) in each question from the information given. Then, think of at least two controlled variables that could be set for each experiment. 9. Do different types of food mold at different rates? Manipulated variable: __________________________ Responding variable: __________________________ Controlled variable 1: __________________________ Controlled variable 2: __________________________ Type of food Rate of molding Exposure to same environment Time span that molding occurs

11 Review of Scientific Variables 10. A scientist was trying to determine if the shape of hot air balloons would affect how high they went. The shape of 10 hot air balloons varied. Some were oval; some were round. The altitude (how high they went) was measured. The scientist tested them on the same day so the weather conditions would be the same. The balloons had the same air volume. Manipulated variable: __________________________ Responding variable: __________________________ Controlled variable 1: __________________________ Controlled variable 2: __________________________ Shape of balloon How high the balloons would go Method of measurement; same day Balloons were same volume

12 Review of Scientific Variables 11. Study the chart below. Identify the manipulated, responding, and controlled variables. Manipulated variable: __________________________ Responding variable: __________________________ Controlled variable 1: __________________________ Controlled variable 2: __________________________ Surface area of sugar sample Time to dissolve Same temperature of water Same size container for sugar and water Sugar SampleWater ConditionsTime to Dissolve (min) Whole sugar cubeHot5 Two-half sugar cubesHot3 Crushed sugar cubehot1


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