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Massachusetts Comprehensive Assessment System

2012, High School Intro Physics

  Question 23: Open-Response  
A 30.0 N force is continuously applied to the right on a 12.0 kg object. The object accelerates on a horizontal frictionless surface. After a certain amount of time, another force of 8.0 N is applied to the left on the object.
  1. Calculate the object’s acceleration before the 8.0 N force is applied. Show your calculations and include units in your answer.
  2. Calculate the object’s acceleration after the 8.0 N force is applied. Show your calculations and include units in your answer.
  3. Is the direction of acceleration in parts (a) and (b) the same or different? Explain your answer.
The object is then pushed onto a slightly rough surface that exerts an additional 20 N frictional force to the left on the object.
  1. Will the object come to rest on the slightly rough surface? Explain your answer.

Scoring Guide and Sample Student Work
Select a score point in the table below to view the sample student response.

ScoreDescription
4 The response demonstrates a thorough understanding of Newton’s second law of motion. The response correctly calculates the object’s acceleration before and after the 8.0 N force is applied, compares and explains the direction of acceleration, and explains whether the object will come to rest after the addition of 20 N of frictional force.
4
3 The response demonstrates a general understanding of Newton’s second law of motion.
2 The response demonstrates a limited understanding of Newton’s second law of motion.
1 The response demonstrates a minimal understanding of Newton’s second law of motion.
0 The response is incorrect or contains some correct work that is irrelevant to the skill or concept being measured.

Note: There are 2 sample student responses for Score Point 4.

High School Intro Physics

Question 12: Electromagnetism
Question 23: Motion and Forces
Question 32: Waves and Radiation
Question 44: Motion and Forces
Question 45: Heat and Heat Transfer

Return to the MCAS 2012 Student Work Directory



Last Updated: June 17, 2016
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