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# Massachusetts Comprehensive Assessment System

## 2014, High School Intro Physics

 Question 45: Open-Response Reporting Category: Motion and ForcesStandard: 1.4 - Interpret and apply Newton's three laws of motion. A 10 N force is applied to a 6 kg box, as shown below.Assume the system is frictionless.Determine the weight of the box in newtons. Show your calculations and include units in your answer.In your Student Answer Booklet, draw a force diagram for the box. Include labels and represent the relative magnitude of each force.Determine the acceleration of the box. Show your calculations and include units in your answer.Now assume friction is introduced into the system.Describe one change to this system that would allow it to achieve the same acceleration as the frictionless system.

### 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 Newton’s three laws of motion and of free-body force diagrams. The response correctly calculates the weight of the box and includes a correct force diagram. The response also correctly calculates the acceleration of the box and clearly describes a change to the system that would achieve the same acceleration as a frictionless system.
4
3 The response demonstrates a general understanding of Newton’s three laws of motion and of free-body force diagrams.
2 The response demonstrates a limited understanding of Newton’s three laws of motion and of free-body force diagrams.
1 The response demonstrates a minimal understanding of Newton’s three laws of motion and of free-body force diagrams.
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.

Question 12:
Question 23:
Question 32:
Question 44:
Question 45: