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# Massachusetts Comprehensive Assessment System

## 2017, High School Intro Physics

 Question 45: Open-Response Reporting Category: Motion and ForcesStandard: 2.4 - Describe both qualitatively and quantitatively the concept of power as work done per unit time A winch is a device used to lift lobster traps out of the water and onto a lobster boat. The winch applies a force of 300 N to lift a trap a distance of 20 m in 12 s.Calculate the work performed by the winch to lift the trap. Show your calculations and include units in your answer.Calculate the power supplied by the winch to lift the trap. Show your calculations and include units in your answer.The winch then lifts a second trap.Explain how the winch could perform the same amount of work but supply a greater amount of power when lifting the second trap.Explain how the winch could supply the same amount of power but perform a different amount of work when lifting the second trap.

### 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 work and power. The response correctly calculates the work performed and power supplied to lift the first trap. The response also clearly explains how the winch could perform the same amount of work but supply a different amount of power, and how the winch could supply the same amount of power but perform a different amount of work.
4
3 The response demonstrates a general understanding of work and power.
2 The response demonstrates a limited understanding of work and power.
1 The response demonstrates a minimal understanding of work and power.
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: