Practical Skills in the Written Papers

What Practical Skills in the Written Papers covers

Module 1, examined in writing rather than in the laboratory. It covers how an experiment is planned and carried out, how data are processed and plotted, and how results and procedures are evaluated.

The 6 subtopics

Each one has its own page.

• Planning an experimentRecall questions on applying physics knowledge to experimental design, control variables, judging whether a method is appropriate, the effect of changing parameters, investigative approaches and selecting equipment and apparatus.Open →
• Implementing and recordingRecall questions on selecting techniques, using apparatus correctly, SI units, presenting data, safe use of equipment, following written instructions, keeping records, research sources, citing sources and recording observations.Open →
• Processing and interpreting dataRecall questions on processing, analysing and interpreting results, valid conclusions, significant figures, gradients and intercepts, y = mx + c, the ln V against time graph, mean values and software for processing data.Open →
• Plotting and interpreting graphsRecall questions on translating between graphical and algebraic forms, rates of change, logarithmic plots for exponential and power laws, choosing scales and axis labels, intercepts, areas under graphs and the shapes of standard graphs.Open →
• Evaluating results and proceduresRecall questions on anomalies, precision and accuracy, apparatus uncertainties, validation by the scientific community, systematic error from intercepts, limitations, margins of error, percentage error, improving procedures and combining uncertainties.Open →
• Mathematical skills and notationRecall questions on calculator skills, degrees and radians, quadratics, the symbols Δ, ∝, ≪ and ≫, probability, ratios, standard form, rearranging equations, geometry formulae, logarithms, order-of-magnitude estimates and small-angle approximations.Open →

What you need to know

Answer each one before you reveal it.

Take Practical Skills in the Written Papers further

The same content, four other ways.

Commonly confused

Pairs that lose marks when they are blurred together.

• Independent variable vs Dependent variable

  Independent variable: the quantity the experimenter deliberately changes. Dependent variable: the quantity measured to see how it responds.

• Control variable vs Confounding variable

  Control variable: a quantity held constant so it cannot affect the outcome. Confounding variable: a quantity that changed alongside the one being investigated and could explain the result.

• Valid experiment vs Reliable experiment

  Valid experiment: one that actually measures what it set out to measure. Reliable experiment: one that gives consistent results when repeated.

Questions from this topic

Each one with the model answer underneath.

1. 1

   Why is it important to apply theoretical physics knowledge when planning an experimental procedure?

   Model answer

   Applying scientific knowledge ensures the experiment is designed to test the correct variables, uses appropriate methods, and produces results that can be meaningfully interpreted in terms of established physics principles.

2. 2

   If you were designing an experiment to investigate the relationship between force and extension of a spring, what scientific knowledge would inform your experimental design?

   Model answer

   Hooke's law (F = kx) would inform the design, including the need to measure force and extension, keep within the elastic limit, and expect a linear relationship with gradient equal to the spring constant.

3. 3

   Define control variables in the context of experimental work.

   Model answer

   Control variables are factors that must be kept constant during an experiment to ensure a fair test.

4. 4

   Why is it necessary to identify variables that must be controlled when planning an experiment?

   Model answer

   Identifying control variables ensures that only the independent variable affects the dependent variable, making the results valid and allowing cause-and-effect relationships to be established.

5. 5

   What does it mean to evaluate whether an experimental method is appropriate?

   Model answer

   It means assessing whether the chosen method can realistically achieve the expected outcomes, produce reliable data, and test the hypothesis or relationship under investigation.

6. 6

   What does evaluating the effect of changing experimental parameters involve?

   Model answer

   Predicting or determining how measurable values will change when one or more variables are altered, based on the relationships between quantities.

What is inside Levo

Six ways to work the same material.

Practical Skills in the Written Papers revision questions

What does Practical Skills in the Written Papers cover in OCR A-Level Physics A?

6 subtopics: planning an experiment, implementing and recording, processing and interpreting data, plotting and interpreting graphs, evaluating results and procedures and mathematical skills and notation. Each one has its own page with questions and model answers.

How is Practical Skills in the Written Papers organised?

By the OCR H556 specification, subtopic by subtopic, so it matches the order you are taught it in.