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WorksheetsExperimental Design
Total questions: 18
Worksheet time: 52mins
Your teacher has asked you to perform an experiment to see if the shape of objects, alone, affects the motion of objects. Which of the following would be the best experiment to perform?
Apply the same amount of force to a ball, cylinder, cube, and pyramid, each of the same mass.
Apply the same amount of force to balls of different mass
Apply the same amount of force to a ball, cylinder, cube, and pyramid, each of a different mass.
Apply different amounts of force to the same ball.
In a controlled scientific experiment, a scientist...
alters the outcome variable (dependent variable) and observes the effects on the test variable (independent variable).
alters one test variable (independent variable) and observes the effects on other test variables (independent variables).
alters the test variable (independent variable) and observes the effects on the outcome variable (dependent variable).
alters one outcome variable (dependent variable) and observes the effects on other outcome variable (dependent variables).
Look at the image of Corey's Science Experiment. What is wrong with the steps of Corey's science experiment?
The log was going to completely burn; therefore, there wouldn't be any ashes left to measure.
He didn't measure the weight of the log before it was burned.
He didn't set a time limit on how long he was going to let the log burn.
He didn't have a partner there in order to verify the results.
You have decided to do an experiment to learn if a certain type of cactus will grow better in a dark closet or a sunny window. To begin your experiment, you place one cactus in a dark closet and one cactus in a sunny window. Over the next month, you record data about the cacti and their appearance every day. At the end of the month, you determine that the cactus in the sun is alive but didn’t grow and that the cactus from the dark closet is alive and grew one centimeter. Can you conclude that a dark closet is better for this type of cacti’s growth?
No, you need to repeat an experiment multiple times before accepting a conclusion.
Yes, one cactus can accurately reflect the behavior of all similar cacti.
Yes, when you are a student your results will be accepted on small-scale studies.
No, you need to use one cactus in both conditions.
Juan is interested in finding out whether hummingbirds are attracted to some flowers more than others. In what order should Juan perform the steps of his experiment?
Make a prediction about which flowers hummingbirds are most attracted to.
Create garden of different flowers.
Observe how many times hummingbirds visit each flowers.
Record her observations.
Write a report on his findings.
Nick is conducting a controlled experiment to test whether music helps daisies grow faster. Below are the steps to Nick's experiment. Which group is the control group?
the green room
the music
flowerpot 2
flowerpot 1
When more than one variable in an experiment is changed at a time, the scientist....
cannot accurately measure both variables at the same time.
needs to conduct more trials in order to get conclusive results.
cannot tell which change produced the results.
made a systematic error that needs to be corrected.
Maggie loves fresh brownies. Her grandma told her if she placed a piece of bread in the storage container with the brownies, the brownies will stay fresh and moist longer. Maggie decides to test this idea. She bakes a batch of brownies. She places 6 brownies in 6 individual plastic containers. Each brownie is the same size and placed in the same location. She adds a piece of bread to three of the bread containers and leaves the other three alone. Each day for 3 weeks she measures the moistness of the brownies and records the results. What is the independent variable?
moistness of brownies
the bread
the containers
brownies
Maggie loves fresh brownies. Her grandma told her if she placed a piece of bread in the storage container with the brownies, the brownies will stay fresh and moist longer. Maggie decides to test this idea. She bakes a batch of brownies. She places 6 brownies in 6 individual plastic containers. Each brownie is the same size and placed in the same location. She adds a piece of bread to three of the bread containers and leaves the other three alone. Each day for 3 weeks she measures the moistness of the brownies and records the results. What is the dependent variable?
Maggie loves fresh brownies. Her grandma told her if she placed a piece of bread in the storage container with the brownies, the brownies will stay fresh and moist longer. Maggie decides to test this idea. She bakes a batch of brownies. She places 6 brownies in 6 individual plastic containers. Each brownie is the same size and placed in the same location. She adds a piece of bread to three of the bread containers and leaves the other three alone. Each day for 3 weeks she measures the moistness of the brownies and records the results. What is the control group?
Maggie loves fresh brownies. Her grandma told her if she placed a piece of bread in the storage container with the brownies, the brownies will stay fresh and moist longer. Maggie decides to test this idea. She bakes a batch of brownies. She places 6 brownies in 6 individual plastic containers. Each brownie is the same size and placed in the same location. She adds a piece of bread to three of the bread containers and leaves the other three alone. Each day for 3 weeks she measures the moistness of the brownies and records the results. What are the constants?
Alex wants to grow some flowers for his wife, but isn't sure which flowers will grow best in the soil in their yard. He goes to Lowe's and buys hydrangeas, roses, daisies, and tulips. He sections off the soil into four equal parts and plants each type of flower in their own section. All flowers receive the same amount of sunlight and waters them all the same amount at the same time daily. He records the growth of the flowers once a week for a month. What is the independent variables?
Alex wants to grow some flowers for his wife, but isn't sure which flowers will grow best in the soil in their yard. He goes to Lowe's and buys hydrangeas, roses, daisies, and tulips. He sections off the soil into four equal parts and plants each type of flower in their own section. All flowers receive the same amount of sunlight and waters them all the same amount at the same time daily. He records the growth of the flowers once a week for a month. What is the dependent variables?
Read the scenario in the image. What is a testable question that Haley could be asking?
Do radishes grow better leave with the most light they are exposed to?
Do radishes grown under bright light grow larger than radishes grown under dim light?
Do radishes grown under dim light grow larger than radishes grown under dimmer light?
Do radishes grow better under greenhouse light than normal sunlight?
Every day at work, Adriana poured a large cup of tea that she drank throughout the morning. She wondered how much bacteria might be growing in her cup of tea as the morning went on.
To find out, Adriana filled three identical cups with tea and placed them on her desk for three hours. After the first hour, she placed a drop of the tea from each cup on a separate microscope slide and counted the number of bacteria in the drop. Adriana repeated this with each cup of tea after the second hour, and again after the third hour.
Which of the following was an independent variable in this experiment?
Read the scenario in the image. What is a testable question that Lila could be asking?
What brand of fabric dye is the best?
Does fabric turn darker when soaked for 30 minutes or 15 minutes?
Does linen fabric turn darker than cotton fabric when soaked in a mixture of black dye and water?
Does dye turn darker the longer it is mixed?
Many types of bacteria cannot survive on objects made of copper. Dr. Greer was considering using beds with copper bed rails instead of beds with plastic rails at the hospital where she worked. She wanted to know if copper bed rails would reduce the number of patients who got new infections.
To test this, Dr. Greer had beds with copper rails placed in half of the hospital rooms. Over the next six months, 430 patients were admitted to the hospital: 215 patients were put in rooms with copper bed rails and 215 patients were put in rooms with plastic bed rails. Dr. Greer counted the number of patients in each type of room who got new infections while they were in the hospital.
Which of the following was an independent variable in this experiment?
Betty had four air plants on her desk that were not growing. She suspected that they needed more water. Betty's sister recommended soaking the air plants in a bowl of water once a week. Betty's coworker recommended spraying the air plants with a mist of water every day.
Betty decided to test both ideas. First, she measured the initial weight of all four air plants. Then, for the next two months, she sprayed two of the plants with a mist of water each day. She watered the two remaining plants by soaking them in water once a week. Finally, Betty measured the weight of the plants again and calculated the change in weight for each plant.
Which of the following was an independent variable in this experiment?
