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Internal Assessment Resource

Physics Level 3

|This resource supports assessment against: |
|Achievement Standard 91521 |
|Carry out a practical investigation to test a physics theory relating two variables in a non-linear relationship |
|Resource title: Baby bouncer |
|4 credits |
|This resource: |
|Clarifies the requirements of the Standard |
|Supports good assessment practice |
|Should be subjected to the school’s usual assessment quality assurance process |
|Should be modified to make the context relevant to students in their school environment and ensure that submitted |
|evidence is authentic |

|Date version published by Ministry of |December 2012 |
|Education |To support internal assessment from 2013 |
|Quality assurance status |These materials have been quality assured by NZQA. NZQA Approved number |
| |A-A-12-2012-91521-01-6244 |
|Authenticity of evidence |Teachers must manage authenticity for any assessment from a public source, because |
| |students may have access to the assessment schedule or student exemplar material. |
| |Using this assessment resource without modification may mean that students’ work is |
| |not authentic. The teacher may need to change figures, measurements or data sources |
| |or set a different context or topic to be investigated or a different text to read or|
| |perform. |

Internal Assessment Resource

Achievement Standard Physics 91521: Carry out a practical investigation to test a physics theory relating two variables in a non-linear relationship

Resource reference: Physics 3.1A

Resource title: Baby bouncer

Credits: 4

Teacher guidelines

The following guidelines are supplied to enable teachers to carry out valid and consistent assessment using this internal assessment resource.

Teachers need to be very familiar with the outcome being assessed by Achievement Standard Physics 91521. The achievement criteria and the explanatory notes contain information, definitions, and requirements that are crucial when interpreting the Standard and assessing students against it.

Context/setting

This activity requires students to test a physics theory relating two variables in a non-linear relationship by taking measurements, using techniques to maximise accuracy, processing and graphically analysing the collected data, determining the equation of the non-linear relationship or the value of a physical quantity, and then critically comparing this with a physics theory.

Conditions

The investigation is to be performed under supervised conditions. Students should work independently to gather and evaluate their own set of data and produce their report. No material is to be taken from the laboratory.

The assessment should be done over a period of time. Three to four hours is recommended for this task.

Conclusions should be written.

Processing can be done manually or with a calculator or computer.

Graphical analysis can be done manually, or by using a calculator capable of graphing or by use of a computer, but the graphical analysis must be able to be stored by the assessor or printed for marking purposes.

Resource requirements

Students will need practical equipment that would allow the construction of a bifilar pendulum, for example:

• metre rulers • springs • stopwatches • clamp stands, clamps and bosses • sets of slotted masses • fiducial mark.

Additional information

None.

Internal Assessment Resource

Achievement Standard Physics 91521: Carry out a practical investigation to test a physics theory relating two variables in a non-linear relationship

Resource reference: Physics 3.1A

Resource title: Baby bouncer

Credits: 4

|Achievement |Achievement with Merit |Achievement with Excellence |
|Carry out a practical investigation to |Carry out an in-depth practical |Carry out a comprehensive practical |
|test a physics theory relating two |investigation to test a physics theory |investigation to test a physics theory |
|variables in a non-linear relationship. |relating two variables in a non-linear |relating two variables in a non-linear |
| |relationship. |relationship. |

Student instructions

Introduction

Baby bouncers behave differently for different sized babies. This assessment activity involves modelling a ‘baby bouncer’ using a spring-mass system in order to test a physics theory involving two variables in a non-linear relationship.

Teacher note: You may need to provide an image.

You will take suitable measurements, use techniques to maximise accuracy, process and graph the collected data, determine the equation of the non-linear relationship and critically compare this with the theoretical relationship between the variables.

At the end of this activity you will hand in a written report.

You will be assessed based upon the thoroughness of your report and the extent to which you relate your investigation to the theory of the context, in this case, the bouncing baby.

Task

Plan and prepare the investigation

The aim of the investigation is to find out how the period of oscillation, T, is affected by the mass, m, which is suspended on the spring.

Construct the following spring-mass system to model a baby bouncer:

[pic]

The theoretical equation linking the period and the mass variables is provided in Resource A.

Do not use a mass greater than as this would stretch the spring beyond its elastic limit. The uncertainty in each slotted mass is ( 4%.

Teacher note: You will need to amend the task based upon the context, but must ensure they supply any unknown values in the theoretical relationship including uncertainties.

Gather data

When gathering your data: • gather a reasonable range of data points • plot the data points and conduct graphical analysis • decide what kind of relationship exists between the variables.

Account for accuracy and uncertainty in your measurements at all steps during the investigation.

Analyse data

To analyse your data: • process your data, including uncertainties • transform your processed data in a way that allows you to plot a suitable linear graph that shows uncertainties • determine a mathematical relationship based on your linear graph that links the period of oscillation, T, and the mass, m.

Write the report

Write your report using the data that you have gathered and analysed. In your report include:

• a summary of the investigative process • a detailed presentation of your results and analysis, including graphical analysis that includes uncertainties • a conclusion that states the equation of the relationship between the variables and compares this to the physics theory • identification of how other uncontrollable variables may have affected the results • consideration of the limitations of the theory’s applicability in the practical situation and/or at the extreme values of the independent variable • a discussion of any unexpected outcomes of the processing of the results and how these have been caused and their impact on the validity of the experiment.

Resource A: Theoretical equation linking the variables

The theoretical equation linking the period of oscillation (T) and mass (m) is:

[pic] where T = time period m = mass k = spring constant

Where for this investigation:

k = 8 x 10-2 ± 1 x 10-2 Nm-1

Assessment schedule: Physics 91521 Baby bouncer

|Evidence/Judgements for Achievement |Evidence/Judgements for Achievement with Merit |Evidence/Judgements for Achievement with Excellence |
|The student has carried out a practical investigation to test a |The student has carried out an in-depth investigation to test a physics |The student has carried out a comprehensive investigation to test a|
|physics theory relating two variables in a non-linear |theory relating two variables in a non-linear relationship. |physics theory relating two variables in a non-linear relationship.|
|relationship: |The in-depth practical investigation involves: | |
|at least five values are measured for the independent and |describing the control of other variable(s) that could significantly affect|Two discussion points are well reasoned and include a clear and |
|dependent variables |the results |logical link between what has happened and the effect it has had on|
|uncertainties in the raw values for T are given |using techniques to improve the accuracy of measurements such as T values |the results/conclusion. This could include: |
|graph variables are either T2 and m or T and √m |repeated and averaged, or multiple periods timed |any other variable(s) that could have changed and significantly |
|graph is correctly plotted (allow one error) and graph line is |determining uncertainties in one of the variables expressed in the |affected the results, and how they could have changed the results |
|straight and a reasonable fit to the plotted points |graphical analysis |any limitations to the theory’s applicability both in the practical|
|an error line is drawn |graphical analysis which expresses the uncertainty in the relationship |situation and/or at extreme values of the independent variable |
|the relationship equation is given as either T2 = gradient value (|consistent with the uncertainty in the data – graph variables are either T2|any unexpected outcomes of the processing of the results and a |
|m, or T = gradient value ( (m |and m or T and (m |suggestion of how they could have been caused and the effect they |
|recognition that the experimental square root relationship is |graph is correctly plotted (allow 1 error) and graph line is straight and |had on the validity of the conclusion. |
|consistent with the theoretical square root relationship. |relevant to the plotted points (error bars are shown and have correct | |
| |length, and error line(s) are also shown and give a reasonable indication | |
| |of the uncertainty in the plotted data) | |
| |providing a conclusion that makes a quantitative comparison between the | |
| |physics theory and the relationship/quantity obtained from the experimental| |
| |data which includes consideration of uncertainties. | |
| | | |

Final grades will be decided using professional judgement based on a holistic examination of the evidence provided against the criteria in the Achievement Standard.

-----------------------
NZQA Approved

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