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# Massachusetts Comprehensive Assessment System

## 2016, High School Intro Physics

 Question 23: Open-Response Reporting Category: ElectromagnetismStandard: 5.4 - Describe conceptually the attractive or repulsive forces between objects relative to their charges and the distance between them (Coulomb's law). Four charged objects, labeled W, X, Y, and Z, are arranged in a straight line, as shown below.Identify the two objects that have the greatest magnitude of electric force between them. Identify the two objects that have the greatest attractive force between them. Explain why these two charges have an attractive force. Identify the two objects that have the smallest magnitude of electric force between them. Explain your answer.

### Scoring Guide and Sample Student WorkSelect 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:
Question 23:
Question 32:
Question 44:
Question 45:

Return to the MCAS 2016 Student Work Directory

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