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Physics  annotated exemplars level 2 AS91168
Carry out a practical physics investigation that leads to a nonlinear mathematical relationship (2.1)
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This annotated exemplar is intended for teacher use only. The student work shown does not always represent a complete sample of what is required. Selected extracts are used, focused on the grade boundaries, in order to assist assessors to make judgements at the national standard.
Low Excellence
Commentary  

For Excellence, the student needs to carry out a comprehensive practical physics investigation that leads to a nonlinear mathematical relationship. This involves writing a discussion that addresses critical issues. Each discussion point could relate to:
See Explanatory Note 2 (EN2) for more detail. This student has comprehensively investigated the nonlinear relationship between the distance that a marble travels down a ramp and the time it takes to do so. This student has attempted to justify the accuracy improving techniques that have been used (1) (2), and has made two attempts to explain the lower than expected value for the acceleration of the marble (4) (5). For a more secure Excellence, the student could make their investigation more comprehensive by:

High Merit
Commentary  

For Merit, the student needs to carry out an indepth practical physics investigation that leads to a nonlinear mathematical relationship. This involves:
See Explanatory Note 2 (EN2) for more detail. This student has investigated, in depth, the nonlinear relationship between the distance that a marble travels down a ramp and the time it takes to do so. This student has gathered and processed data appropriately and has stated the mathematical relationship. An attempt has been made to justify the accuracy improving techniques that have been used (1) and to explain the control of a significant variable (2). The student has attempted to explain the unexpected difference between the theory and experimental results (3) (4). To reach Excellence, the student could make their investigation comprehensive by:

Low Merit
Commentary  

For Merit, the student needs to carry out an indepth practical physics investigation that leads to a nonlinear mathematical relationship. This involves:
See Explanatory Note 2 (EN2) for more detail. This student has investigated, in depth, the nonlinear relationship between the distance that a marble travels down a ramp and the time it takes to do so. This student has used appropriate accuracy improving techniques (1) (3). The student has attempted to describe the control of significant variables (2) and has attempted to identify the mathematical relationship (4). For a more secure Merit, the student could make their investigation more indepth by:

High Achieved
Commentary  

For Achieved, the student needs to carry out a practical physics investigation that leads to a nonlinear mathematical relationship. This involves:
See Explanatory Note 2 (EN2) for more detail. This student has investigated, in depth, the nonlinear relationship between the distance that a marble travels down a ramp and the time it takes to do so. This student has collected six sets of data over an appropriate range of values (2). An appropriate nonlinear graph has been drawn (3) and the student has correctly stated the type of relationship (4). The student has used increased accuracy by repeating and averaging the time measurements (2) and has reduced parallax error when measuring distances (6). The student has made an attempt to identify a variable that needs to be controlled (1) and to construct the correct mathematical equation (5). To reach Merit, the student could:

Low Achieved
Commentary  

For Achieved, the student needs to carry out a practical physics investigation that leads to a nonlinear mathematical relationship. This involves:
See Explanatory Note 2 (EN2) for more detail. This student has investigated, in depth, the nonlinear relationship between the distance that a marble travels down a ramp and the time it takes to do so. This student has collected six sets of data over an appropriate range of values (1). An attempt has been made to process the data so that an appropriate nonlinear graph can be drawn (2). The student has correctly stated the type of relationship (3). For a more secure Achieved, the student could:

High Not Achieved
Commentary  

For Achieved, the student needs to carry out a practical physics investigation that leads to a nonlinear mathematical relationship. This involves:
See Explanatory Note 2 (EN2) for more detail. This student has investigated, in depth, the nonlinear relationship between the distance that a marble travels down a ramp and the time it takes to do so. The student has collected data over an appropriate range of values (1) and has attempted to draw an appropriate graph to show the relationship (2). To reach Achieved, the student could:
