Controls and Variables

A study was done to find if different tire treads affect the braking distance of a car. What is the independent variable?

• the brakes in a car

• the braking distance of a car

• different tire treads

• different study times

Tags

NGSS.MS-ETS1-2

NGSS.MS-PS2-2

A study was done to find if different tire treads affect the braking distance of a car. What is the dependent variable in this experiment?

• car brakes

• the braking distance

• different tire treads

• the time of the study

Tags

NGSS.MS-PS2-2

A study was done to find if different tire treads affect the braking distance of a car. What are some controls/constants that they need to have in this experiment?

• The model of the cars used

• The pavement conditions

• The speeds the cars are traveling.

• All of the above

Tags

NGSS.MS-PS2-2

Four groups of rats are first weighed and then fed identical diets except for the amount of vitamin A they receive. Each group gets a different amount. After 3 weeks on the diet, the rats are weighed again to see if there has been a decrease. What is the independent variable?

• The rats

• The rats' weights

• The rats' diets

• The Vitamin A

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Four groups of rats are first massed and then fed identical diets except for the amount of vitamin A they receive. Each group gets a different amount. After 3 weeks on the diet, the rats’ masses are measured again to see if there has been a decrease. What is the dependent variable?

• The rats

• The rats' weight

• The rats' diet

• The Vitamin A

Tags

NGSS.MS-LS1-5

Four groups of rats are first massed and then fed identical diets except for the amount of vitamin A they receive. Each group gets a different amount. After 3 weeks on the diet, the rats’ masses are measured again to see if there has been a decrease. What was a control/constant?

• The rats

• The rats' weights

• The rats' diets

• The Vitamin A

Tags

NGSS.MS-LS1-5

The time it takes to run a mile depends on the person’s running speed. What is the independent variable?

• The time it takes to run a mile

• The person's running speed

• The person's fitness level

• The weather

The time it takes to run a mile depends on the person’s running speed. What is the dependent variable?

• The time it takes to run a mile

• The person's running speed

• The person's fitness level

• The Control

An investigation found that more bushels of potatoes were produced when the soil was fertilized more. Identify the independent variable.

• the fertilizer in the soil

• the bushels of potatoes

• the type of potatoes

• the amount of water

Tags

NGSS.MS-LS1-5

An investigation found that more bushels of potatoes were produced when the soil was fertilized more. Identify the dependent variable.

• the fertilizer in the soil

• the bushels of potatoes

• the type of potatoes

• the weather

Tags

NGSS.MS-LS1-5