Understanding Variables in Scientific Investigations

Why is it important to change only one variable in a scientific investigation?

• To ensure the experiment is quick

• To accurately identify the cause of the results

• To use more resources

• To make the experiment more complex

What is an independent variable?

• The variable you change

• The variable that is not used

• The variable you keep the same

• The variable you measure

Which variable is measured in an experiment?

• Random variable

• Independent variable

• Control variable

• Dependent variable

In the exercise and body temperature investigation, what is the independent variable?

• Time of day

• Heart rate

• Exercise

• Body temperature

In the exercise and body temperature investigation, what is the dependent variable?

• Type of exercise

• Body temperature

• Heart rate

• Exercise

In the caffeine and heart rate investigation, what is the independent variable?

• Exercise

• Caffeine

• Heart rate

• Body temperature

In the caffeine and heart rate investigation, what is the dependent variable?

• Caffeine

• Exercise

• Body temperature

• Heart rate

In the ball temperature and bounce height investigation, what is the dependent variable?

• Temperature of the ball

• Material of the ball

• Height of the bounce

• Type of ball

What is a control variable in an experiment?

• The variable you change

• The variable you measure

• The variable you keep the same

• The variable that is not used

In the ball temperature and bounce height investigation, which of the following could be a control variable?

• Temperature of the ball

• Height of the bounce

• Time of day

• Type of ball