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# Massachusetts Comprehensive Assessment System

## 2017, High School Intro Physics

 Question 32: Open-Response Reporting Category: Motion and ForcesStandard: 1.3 - Create and interpret graphs of 1-dimensional motion, such as position vs. time, distance vs. time, speed vs. time, velocity vs. time, and acceleration vs. time where acceleration is constant. An object is moving along a straight path. The graph below shows the object's distance from the starting point during a certain time interval.Determine the average speed of the object for the time interval 0–2 s. Show your calculations and include units in your answer.Describe how the speed of the object is changing as it passes through point S. Explain your answer.Identify the point (S, T, or U) at which the velocity of the object is equal to zero. Explain your answer.Determine the distance moved and the displacement of the object for the time interval 0–4 s. 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 interpreting a distance versus time graph of 1-dimensional motion. The response correctly determines the average speed from 0–2 s and clearly describes how the speed is changing as it passes through point S and clearly explains the answer. The response correctly identifies the point at which the velocity is zero and clearly explains the answer. The response also correctly determines the distance moved and the displacement over 0–4 s and clearly explains the answer.
4
3 The response demonstrates a general understanding of interpreting a distance versus time graph of 1-dimensional motion.
2 The response demonstrates a limited understanding of interpreting a distance versus time graph of 1-dimensional motion.
1 The response demonstrates a minimal understanding of interpreting a distance versus time graph of 1-dimensional 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.

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