Understanding Experimental Investigations

What is the key principle of a simple experimental investigation?

• Keep all variables constant and measure one

• Change one variable, measure another, and keep the rest constant

• Change all variables and measure one

• Measure all variables and change none

In the toy car investigation, what was the variable that was changed?

• The height of the ramp

• The type of car

• The length of the ramp

• The surface of the ramp

What tool was used to measure the distance the cars traveled?

• A ruler

• A tape measure

• A meter stick

• A stopwatch

Which of the following was kept constant in the investigation?

• The angle of the ramp

• The height of the ramp

• The distance measured

• The type of cars and tracks

What was the main research question of the investigation?

• How does the type of car affect speed?

• How does the surface of the ramp affect distance?

• How does the height of the ramp affect the distance the car rolls?

• How does the length of the ramp affect time?