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Massachusetts Comprehensive Assessment System

2016, High School Intro Physics

  Question 23: Open-Response  
Four charged objects, labeled W, X, Y, and Z, are arranged in a straight line, as shown below.
The diagram shows four charged objects that are labeled: W, X, Y, and Z. From the left object W has a charge of plus three q,  object X has a charge of plus four q, object Y has a charge of plus 6 q, and object Z has a charge of minus 2 q. The distance between object W and object X is two meters. The distance between object X and object Y is one meter. The distance between object Y and object Z is one meter.
  1. Identify the two objects that have the greatest magnitude of electric force between them.
     
  2. Identify the two objects that have the greatest attractive force between them. Explain why these two charges have an attractive force.
     
  3. Identify the two objects that have the smallest magnitude of electric force between them. 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 Coulomb’s law. The response correctly identifies the two objects with the greatest magnitude of electric force between them. The response correctly identifies the two objects with the greatest attractive force between them and clearly explains the answer. The response also correctly identifies the two objects that have the smallest magnitude of electric force between them and clearly explains the answer.
4
3 The response demonstrates a general understanding of Coulomb’s law.
2 The response demonstrates a limited understanding of Coulomb’s law.
1 The response demonstrates a minimal understanding of Coulomb’s law.
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: Waves and Radiation
Question 23: Electromagnetism
Question 32: Motion and Forces
Question 44: Heat and Heat Transfer
Question 45: Motion and Forces

Return to the MCAS 2016 Student Work Directory



Last Updated: October 17, 2017
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