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# Massachusetts Comprehensive Assessment System

## 2015, High School Intro Physics

 Question 32: Open-Response Reporting Category: Motion and ForcesStandard: 2.2 - Interpret and provide examples of how energy can be converted from gravitational potential energy to kinetic energy and vice versa. The diagram below shows three points on a roller coaster track. A car starts from rest at point X and travels along the track. Assume friction is negligible.Identify whether the car’s gravitational potential energy increases, decreases, or stays the same as the car moves from point X to point Y.Identify whether the car’s kinetic energy increases, decreases, or stays the same as the car moves from point Y to point Z.The car has a mass of 600 kg.Calculate the gravitational potential energy of the car at its maximum height. Show your calculations and include units in your answer.Calculate the maximum kinetic energy of the car. Show your calculations and include units in 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 how energy can be converted from gravitational potential energy to kinetic energy and vice versa. The response correctly identifies whether the car’s gravitational potential energy and kinetic energy increase, decrease, or stay the same. The response also correctly calculates the gravitational potential energy of the car at its greatest height and the maximum kinetic energy of the car.
4
3 The response demonstrates a general understanding of how energy can be converted from gravitational potential energy to kinetic energy and vice versa.
2 The response demonstrates a limited understanding of how energy can be converted from gravitational potential energy to kinetic energy and vice versa.
1 The response demonstrates a minimal understanding of how energy can be converted from gravitational potential energy to kinetic energy and vice versa.
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: