Setting Up an Experiment

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Presentation transcript:

Setting Up an Experiment Experimental Design 8th Grade Science

Pinewood Derby

Does the mass of a derby car affect its speed? Scientific Question (problem): Does the mass of a derby car affect its speed?

What is being tested or compared in an experiment. It is what the experiment is all about It is the “cause.” It is the “before”

What is being tested or compared? Does the mass of a derby car affect its speed?

The outcome or the results of the experiment What is being measured. It is the “effect.” It is the “after.”

What is being measured? Does the mass of a derby car affect its speed?

How to Write a Hypothesis Describe the relationship between the IV & DV: The more/less of the _IV_, the more/less the ___DV__.

The Hypothesis should predict… As the IV (increases or decreased), the DV (increases or decreases).

Hypothesis The more mass the car has, the faster it will go. or The less mass the car has, the faster it will go.

Stay the same throughout the experiment Constant Variables Stay the same throughout the experiment

Constants Race course (distance, steepness, etc) Wheel size Shape Same kind of wood/brand Drop time (release levers)

Control Group It represents what is Normal. Doesn’t get any treatment.

Experimental Group Different amounts of mass.

Control (normal) – plain wooden car Experimental Group- Different weights added to car

Treatment Description Control Group 1 Group 2 Group 3 Plain, wooden car (5 oz. =141g) car + 8g (5.25oz = 149g) car + 15g (5.5oz = 156 g) car + 29g (6oz = 170 g)

Write hypothesis & complete design chart Does the shape of the pinewood derby car, affect its speed? Hint: use word “aerodynamics”