We call each time a test is run during an investigation a _​ (a)  

• trial
• test
• sample
• experiment

In an experimental investigation, a scientist changes _______ thing.

• some

• one

• two

• all

What does a scientist intentionally change in an experimental investigation?

• The dependent variable

• The independent variable

• The constants

• The results

Adding and removing books means we changed the ___ of the ramp.

What does a spring scale measure?

• distance

• strength

• force

• weight

What are the elements that are kept the same between trials in an experimental investigation?

• Variables

• Trials

• Constants

• Results

What 2 things do you need to look at to form a question in an investigation?

• What is changed

• how well the experiment worked

• What is being measured

• Where the experiment was conducted

Sometimes need to think about what a measurement or observation ____.

Experiments need to be _______ when the scientist changed more than one thing.