Three resources. Three different jobs.
Today follows three blocks: learn on the WEBSITE, research in the RESEARCH TRAIL, then return to your STUDENT DOCUMENT to refine P1.
1. What does “incline” mean as data?
The assignment title says incline. Your investigation still needs a numerical IV that you can deliberately vary.
Possible numerical descriptions
Depending on equipment and method, incline might be represented by an angle, a rise compared with a fixed length, or another clearly defined numerical measure.
The important point is not that everyone uses the same representation. It is that your IV is measurable, repeatable and suitable for your investigation.
What makes a useful range?
- wide enough to reveal a pattern;
- small enough to be practical and safe;
- several values rather than only two extremes;
- measurable with the equipment available;
- chosen for a reason, not at random.
2. How can acceleration be obtained?
Acceleration is the scenario outcome, but different investigations may obtain it in different ways.
Direct sensor
A sensor/data logger may produce motion data directly.
Velocity change
Measure how velocity changes over a measured time interval.
Distance & time
Use measured motion over a known distance and an appropriate model to calculate acceleration.
Video analysis
Track position over time and obtain motion data from the recording.
3. The physics you actually need
Enough science to explain the relationship — not an A-level mechanics detour.
Gravity and the slope
- Gravity acts vertically downward on the object.
- On an inclined surface, part of that gravitational effect acts in the direction down the slope.
- As the slope becomes steeper, the downhill effect of gravity becomes greater.
- A greater resultant force down the slope can produce a greater acceleration.
- Friction, rolling resistance and the behaviour of the moving object can reduce or alter the measured acceleration.
Useful link to earlier physics
As an object moves down a slope, gravitational potential energy decreases while kinetic energy increases.
Eₚ = mghEₖ = ½mv²
Some energy can also be transferred through friction, sound, heating or rotation.
4. Control variables: explain why they matter
A useful control variable is something that could otherwise affect your measured acceleration.
Which explanation is stronger?
Control variable: object used.
Ask three questions for every possible control
- Could this factor affect the DV?
- How could it be kept the same or monitored?
- Does it genuinely matter for my chosen method?
Examples might include the object, surface, release method, starting position, measurement distance and equipment position — but only include controls that are relevant to your design.
5. Research that helps you make decisions
Today your research should narrow the investigation, not simply add more notes.
Research questions to investigate
- How will you represent and measure incline?
- How could acceleration be obtained with equipment available to you?
- What range of IV values appears practical and scientifically useful?
- Which factors need controlling for your method?
- What numerical secondary data is relevant enough to keep for M7 later?
Look for research → decision links
The decision must still be yours. Research should inform it, not make it for you.
First build enough research to make a defensible choice. Then return to the website and switch to your Student Document.
6. Refine P1
Your question should now be much more precise because your research has helped you make choices.
Final P1 checks
- One IV and one DV.
- IV measured over a suitable numerical range.
- Quantitative data for both variables.
- An indication of how the investigation will be performed.
- Research has genuinely informed the question.
- Relevant numerical secondary data has been retained for later comparison.
- The investigation appears safe and practical within centre constraints.
Use your own research to explain
- which findings were most useful;
- which choices those findings influenced;
- why the research question you have arrived at is experimentally workable;
- what secondary data you have kept for later.
These are prompts, not a structure you must copy.
Ready for Lesson 5?
You should now be able to defend your choices without reading from the website.
- I can state exactly how my IV will be represented numerically.
- I can explain how acceleration could be obtained.
- I can justify the controls that genuinely matter.
- I can point to research that influenced my decisions.
- I have retained relevant numerical secondary data.
- My P1 question includes IV, DV and method.
- I understand the basic physics linking incline and acceleration.
- I know which parts of my investigation still need testing before a full plan can be finalised.