Lab Variables

Should experiments be repeated over and over to see if the results are the same each time?

• yes
• no

The one variable in an experiment that is purposely changed by the scientist is the________________.

• dependent variable

• independent variable

• data

• control group

Research Question: Does the type of gasoline put in a car affect how fast the car can drive.

What is the independent variable?

• Type of gasoline

• which car the gas is put into

• how fast the car can drive

• how much gas is put into the car

Does changing the scent of a brand of dog food affect how much the dog eats?

Which variable is the part in red?

• independent

• dependent

If I study for my scientific method quiz, then I will have a better test score. What is the dependent variable?

• Scientific Method
• Studying
• Independent variable
• Test score

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...

• The type of plant
• The amount of sunlight
• The type of music
• The type of liquid

Tags

NGSS.MS-LS1-5

Mr. S set up an experiment to see how the mass of a ball affects the distance it rolls off a ramp. Identify the independent variable.

• Distance traveled by the ball
• Height of the ramp
• Mass of the ball

Tags

NGSS.MS-PS2-2

Changes in the _________ variable causes changes in the _________ variable.

• independent; dependent

• dependent; independent

What are the control variables?

• The thing the experimenter changes

• The thing the experimenter measures

• The thing the experimenter keeps the same

• The things the experimenter needs to think about

Tags

NGSS.MS-PS2-2

Which is the only variable which can be changed in an experiment to make a fair test?

• independent

• control

• dependent

• all of them

Tags

NGSS.MS-PS2-2