Is this a horribly ambiguous A Level Physics question?

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Discussion Overview

The discussion revolves around the ambiguity of A Level Physics exam questions and marking schemes, particularly those from OCR. Participants explore specific examples of questions that seem unclear or overly strict in their requirements, and they seek broader perspectives on how such questions are interpreted and assessed in the context of physics education.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant expresses concern about the interpretation of the term "rate," arguing that it does not necessarily imply an increasing quantity, citing "rate of pay" as an example.
  • Another participant agrees, stating that "deceleration" is indeed a form of acceleration with a negative value, challenging the idea that it should not be used interchangeably with "acceleration."
  • Some participants discuss the implications of strict marking schemes, suggesting that they may hinder the ability of markers to apply common sense in evaluating answers.
  • A specific example from an OCR exam question is analyzed, where participants question the requirement to justify the variation of resistance in an LED, feeling that the expectations are not clearly communicated.
  • Concerns are raised about the prohibition of terms like "rate of acceleration" in marking schemes, with participants questioning the rationale behind such restrictions.
  • There is a discussion about the potential confusion caused by the language used in physics questions, particularly regarding terms like "constant acceleration" and "deceleration."

Areas of Agreement / Disagreement

Participants generally agree on the ambiguity of certain terms and the strictness of marking schemes, but there is no consensus on the correct interpretation of specific terms like "rate" and "acceleration." The discussion remains unresolved regarding the appropriateness of the marking criteria and the clarity of exam questions.

Contextual Notes

Participants note that the interpretation of terms may depend on context and that the language used in physics must be precise. There are unresolved issues regarding how marking schemes are applied and the implications of their strictness on student assessment.

  • #61
From the OP:
ChrisXenon said:
For example they maintain that the word "rate" implies an increasing quantity, whereas I believe that "rate of pay" simply means how much you get paid. They say that "acceleration" will not do when a body is decelerating whereas I think that "deceleration" is an acceleration with a negative value and that all decelerations are accelerations.
As used in mathematics and physics textbooks, "rate" is a ratio that implies a change in two quantities. A decent mathematics or physics textbook would never use the phrase "rate of pay" unless the problem involved salaries that were increasing or decreasing over time.

With regard to acceleration/deceleration, if an object's velocity is decreasing and the available options describing the situation were these two choices :
a) the object is accelerating,
b) object is decelerating,
the first choice would be wrong.
 
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  • #62
We're now at 62 posts for this thread. Seems like a good place to end it.
Thread closed.

If someone has some information that hasn't already been discussed, contact me or another mentor, and we'll consider reopening the thread.
 
Last edited:
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