Science Assessment ~ Items ~ CR022002

Next Item: CR020003 »

A student wants to buy a new skateboard. He wants to find out if the size of the wheels affects how far he can coast on the skateboard. He also wants to find out if the type of material the board is made of affects how far he can coast on the skateboard.

He decides to compare two skateboard models that are the same size but are made of different materials and have different size wheels:

He pushes off as hard as he can and stands on the skateboard until the skateboard comes to a stop. He tries each skateboard 5 times to see how far he can go. He uses the same pavement and the same starting point for all the trials.

He finds out that he can coast farther with Model 1.

What can he conclude from this test?

He can conclude that the size of the wheels affects how far he can coast on the skateboard.
He can conclude that the material of the board affects how far he can coast on the skateboard.
He can conclude that the size of the wheels affects how far he can coast on the skateboard and that the material of the board affects how far he can coast on the skateboard.
It is NOT possible to conclude from this test if the size of the wheels affects how far he can coast on the skateboard or if the material of the board affects how far he can coast on the skateboard.

Details
Performance
NGSS

Topic: Control of Variables
Correct Answer: D
Misconceptions

Distribution of Responses

Chart showing distrubtion of responses for Item CV022002

Students Responding Correctly

Group	Correct	Total	Percent
Overall	1438	5075	28%
Grades
6–8	576	2806	21%
9–12	853	2246	38%
Gender
Male	738	2498	30%
Female	678	2516	27%
Primary Language
English	1279	4359	29%
Other	120	612	20%

View data table

NRC Framework: HS Practice 3: Consider possible confounding variables or effects and ensure that the investigation’s design has controlled for them.

Science Assessment

Item CR022002: In an experiment involving skateboards, in which the size of the wheels and the material the skateboards are made of are both varied at the same time, it is not possible to find out if either of these variables affects the performance of the skateboard.