Science Assessment ~ Items ~ FM067003

An object is moving forward and no forces are acting on it. Every second, the object's speed is recorded. When the clock reads 0 seconds, the object's speed is 10 miles per hour (mi/hr). When the clock reads 2 seconds, a force begins to push the object forward. The force continues to act until the clock reads 4 seconds and then the force stops acting.

Clock →	0 seconds	1 second	2 seconds	3 seconds	4 seconds	5 seconds	6 seconds
Row A	10 mi/hr	9 mi/hr	8 mi/hr	8 mi/hr	8 mi/hr	7 mi/hr	6 mi/hr
Row B	10 mi/hr	10 mi/hr	10 mi/hr	11 mi/hr	12 mi/hr	13 mi/hr	14 mi/hr
Row C	10 mi/hr	10 mi/hr	10 mi/hr	11 mi/hr	12 mi/hr	12 mi/hr	12 mi/hr
Row D	10 mi/hr	11 mi/hr	12 mi/hr	13 mi/hr	14 mi/hr	15 mi/hr	16 mi/hr

Which row of the table could be a correct representation of the object's speed between 0 seconds and 6 seconds? Assume that if a change in speed has occurred, the change is shown in the table.

Row A
Row B
Row C
Row D

Details
Performance
NGSS

Topic: Force and Motion
Correct Answer: C
Misconceptions

Distribution of Responses

Chart showing distrubtion of responses for Item FM067003

Students Responding Correctly

Group	Correct	Total	Percent
Overall	692	1796	39%
Grades
6–8	383	1129	34%
9–12	304	658	46%
Gender
Male	340	837	41%
Female	332	912	36%
Primary Language
English	614	1582	39%
Other	62	179	35%

View data table

Disciplinary Core Ideas: PS2.A The motion of an object is determined by the sum of the forces acting on it; if the total force on the object is not zero, its motion will change. The greater the mass of the object, the greater the force needed to achieve the same change in motion. For any given object, a larger force causes a larger change in motion.
PS2.A Newton's second law accurately predicts changes in the motion of macroscopic objects.

Science Assessment

Item FM067003: Use of tables of speed versus time, and information about forces acting on an object, to determine the object's speed at various times.