Parts of a Controlled Experiment

How many variables can be tested in a controlled experiment?

• one
• two
• three
• as many as possible

Things that stay the same throughout the whole experiment are called

• controls
• dependent variables
• independent variables
• constants

This variable in an experiment is the one being deliberately changed by the scientist. 

• dependent variable
• independent variable
• data
• control group

Experiment: Sendel wants to see if taking the backroads to work is faster than taking the highway during rush hour.

In Sendel's driving experiment, what is the independent variable?

• What time of day she drives

• The route she takes to work

• The speed at which she drives

• The time is takes to get to work

An experiment is conducted to test how different cleats change an athletes running speed.  Six different types of cleats are tested and the 100m run time is recorded.  What is the independent variable?

• The type of cleat
• The run time
• The 100 meters
• The athlete

A student wants to test the effects of different types of exercise on heart rate.  What is the dependent variable?

• heart rate
• type of exercise
• amount of exercise
• time of day exercise occurs

Tags

NGSS.HS-ETS1-2

This variable is the actual data collected during the experiment. 

• independent variable
• dependent variable
• control group
• data group

Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground.

What are two controlled variables? (Select 2 answers)

• Dropping the same way

• Wing Length

• Amount of time it takes the helicopter to hit the floor

• Dropping from the same height

A student performed an experiment that tested how many days it takes different types of grass seed to grow to a height of two inches. Four types of grass seed were tested, and the student recorded the number of days for each type to grow. Use this information to answer the next question.

What should be held constant in this experiment?

• amount of sunlight, amount of water, and type of soil

• amount of sunlight

• amount of water and type of soil

• amount of water

Tags

NGSS.MS-LS1-5

Jordan is doing a science project on the effects of music on the growth of tomatoes. He has 2 plants, 1 will be exposed to classical music, the 2nd won't be around music. What is the manipulated variable?

• music

• type of tomato

• music volume

• number of tomatoes

Tags

NGSS.MS-LS1-5