Massachusetts Comprehensive Assessment System
2011, High School Intro Physics
Question 44: OpenResponse 

Reporting Category: Motion and Forces Standard: 1.2  Distinguish between displacement, distance, velocity, speed, and acceleration. Solve problems involving displacement, distance, velocity, speed, and constant acceleration.

A person is driving his car to a store. The store is 800 m north of the personâ€™s starting point. After traveling north 1200 m, the person realizes that he has passed the store. He turns the car around and drives back to the store. Altogether, the trip to the store takes 100 s. Determine the distance traveled by the car on this trip to the store. Show your calculations and include units in your answer.
 Calculate the average speed of the car on this trip. Show your calculations and include units in your answer.
 Determine the displacement of the car for this trip. Include units in your answer.
 Calculate the average velocity of the car upon arrival at the store. Show your calculations and include units in your answer.

Scoring Guide and Sample Student Work Select a score point in the table below to view the sample student response.
Score  Description 
4 
Response demonstrates a thorough understanding of distance, displacement, speed, and velocity, and how to solve problems involving these quantities. Response includes correct calculations of the distance traveled, the average speed, the displacement, and the average velocity of the car. 
4 
3 
Response demonstrates a general understanding of distance, displacement, speed, and velocity, and of how to solve problems involving these quantities. 
2 
Response demonstrates a limited understanding of distance, displacement, speed, and velocity, and of how to solve problems involving these quantities. 
1 
Response demonstrates a minimal understanding of distance, displacement, speed, and velocity, and of how to solve problems involving these quantities. 
0 
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.
None found...
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Last Updated: September 04, 2014
