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Massachusetts Comprehensive Assessment System

2012, High School Intro Physics

  Question 44: Open-Response  
A student lifts a 10.0 kg box from the floor at a constant speed to a shelf that is 1.5 m above the floor.
  1. Construct a free-body force diagram that represents the forces acting on the box when it is 1.0 m above the floor. Be sure to label your diagram.
  2. Explain how you know that work is being done on the box, and how the work results in a change in the energy of the box.
  3. Calculate the amount of work done on the box and the change in potential energy of the box. 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.

ScoreDescription
4 The response demonstrates a thorough understanding of free body diagrams and how work can be expressed both qualitatively and quantitatively as a change in mechanical energy. The response correctly constructs a free-body force diagram for the box. The response explains the evidence that shows work is being done and explains how work results in a change in the box’s energy. The response also correctly calculates both the work done and the change in potential energy.
4
3 The response demonstrates a general understanding of free body diagrams and how work can be expressed both qualitatively and quantitatively as a change in mechanical energy.
2 The response demonstrates a limited understanding of free body diagrams and how work can be expressed both qualitatively and quantitatively as a change in mechanical energy.
1 The response demonstrates a minimal understanding of free body diagrams and how work can be expressed both qualitatively and quantitatively as a change in mechanical energy.
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: Electromagnetism
Question 23: Motion and Forces
Question 32: Waves and Radiation
Question 44: Motion and Forces
Question 45: Heat and Heat Transfer

Return to the MCAS 2012 Student Work Directory



Last Updated: September 26, 2016
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