Scientific & Engineering Practices #1

Juan wanted to know if different brands of tires would make his model car go faster. Juan correctly set up an experiment to test 4 different brands of tires on his model car. What is the Independant variable? (What is the scientist changing?)

• The independent variable is the model car.

• The independent variable is how fast the model car is moving

• The independent variable is the different brands of tires

• The independent variable is the race track.

Juan wanted to know if different brands of tires would make his model car go faster. Juan correctly set up an experiment to test 4 different brands of tires on his model car. What is the dependant variable? (What is being measured?)

• The dependent variable is the model car.

• The dependent variable is how fast the model car is moving

• The dependent variable is the different brands of tires

• The dependent variable is the race track.

Students used various temperatures of water to see which one dissolved candy faster.

What was the independent variable?

• amount of candy

• amount of water

• temperature of water

• time for candy to dissolve

Students wanted to see if the type of material affected the change in the material's temperature after being placed under a heat lamp for 10 minutes.

What is the dependent variable for this investigation?

• type of material (rocks, sand etc)

• temperature after 10 minutes

• time under the lamp

• heat lamp, amount of material

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

In the experiment shown, plant A received 50 mL of coke each day, plant B received 50 mL of juice, and plant C received 50 mL of water. Every day for one week, plant growth was measured. Identify the dependant variable.

• The liquids.

• The same kinds of plant.

• Amount of liquid given to each plant

• The soil used for the plants.

• The growth of each plant.

In the experiment shown, plant A received 50 mL of coke each day, plant B received 50 mL of juice, and plant C received 50 mL of water. Every day for 1 week, plant growth was measured. What are the controlled variables? What are things that should be kept the same? CHOOSE ALL THAT APPLY

• same amount and kind of coke, juice, and water used on the plants each day

• type of pots, soil, and lights

• type of plants used

• time of day watered and measured

• same liquid to give every plant.

Candace conducted an experiment to see if her rose bushes would grow taller when watered with soda. She planted three rows of rose bushes and poured one can of soda on each plant daily. Each row received a different type of soda. Every Friday, she carefully measured and recorded the height of each plant. How could Candace improve her experiment?

• plant a different type of rose bush in each row

• pour different amounts of soda on each row

• add a row of rose bushes that receive water instead of soda

• put a row of rose bushes in the house

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Bob wanted to conduct an experiment to determine which type of soap makes the largest soap bubbles. Identify the controlled variables. (What must remain the same in every trial for the experiment to work? CHOOSE ALL THAT APPLY

• the type of soap used

• the wand used to make the bubbles

• the size of the bubbles

• the amount of soap used

Bob wanted to conduct an experiment to determine which type of soap makes the largest soap bubbles. What is the independent variable? (What is the scientist changing?).

• the type of soap used

• the wand used to make the bubbles

• the size of the bubbles

• the amount of soap used

If plants are exposed to sunlight, then they will grow taller.
What part of the scientific method is this an example of?

• Procedure
• Hypothesis
• Question
• Results

Tags

NGSS.MS-LS1-5

NGSS.MS-LS1-6