PRESSURE LAB · ENGINEERING BAY: A support pad sinks into soft ground while a cutting tool fails to penetrate its target material. Both problems involve force — but the missing variable is contact area. Calculate the pressure, change the geometry and decide when the system should spread a load and when it should concentrate it.
ACTIVE OBJECTIVEPRESSURE LAB · ENGINEERING BAY: A support pad sinks into soft ground while a cutting tool fails to penetrate its target material. Both problems involve force — but the missing variable is contact area. Calculate the pressure, change the geometry and decide when the system should spread a load and when it should concentrate it.
Optional: pen + paper for rough working if that helps you think.
HOW TO DO IT
Read or listen to the Briefing + Learn.
Do the interactive mission.
Use facts from the reading and maths parts.
Make your choice and save your project step.
Play the weekly game. Finish Check-in.
WORK YOUR WAY
Short bursts are fine. Use Learning Tools for easier reading, read-aloud, less on screen, stronger contrast, no-rush and quieter-screen options.
If you get stuck, look at the example and try again.
SCIENCE SAFETY: The science investigations in this Senior mission are designed as virtual/screen-based activities unless the page clearly says otherwise. Do not improvise mains electricity, heating or chemical experiments at home.
PROJECT NOTE: Your project can stay digital. Physical making is optional unless you choose that format.
MISSION BRIEFING
PRESSURE LAB · ENGINEERING BAY: A support pad sinks into soft ground while a cutting tool fails to penetrate its target material. Both problems involve force — but the missing variable is contact area. Calculate the pressure, change the geometry and decide when the system should spread a load and when it should concentrate it.
✓Use pressure = force ÷ area to calculate pressure in pascals for idealised contact situations.
✓Explain why increasing contact area lowers pressure when force is held constant and why decreasing area raises it.
✓Connect one pascal with one newton per square metre and use units correctly in calculations.
✓Evaluate whether an engineering design should spread or concentrate force based on purpose rather than treating high or low pressure as universally better.
✓Identify limitations of the simple pressure model, including uneven load distribution, deformation, material limits and local stress concentrations.
MISSION MEDIA · Cognito
What Is Pressure?
Connect force, contact area and pressure before redesigning the rescue platform.
Captions are controlled inside the YouTube player. If the embed is unavailable, use the YouTube link.
LEARN
PURPOSE → FORCE → AREA → PRESSURE → REDESIGN
PRESSURE describes how much force acts over a given area. In the idealised model, P = F ÷ A. If the same force is spread over a larger area, pressure decreases. If that force is concentrated onto a smaller area, pressure increases. Engineers use both effects: foundations and snowshoes spread loads; sharp edges and points concentrate force. The correct design depends on purpose, material strength, stability and safety. Use PURPOSE → FORCE → AREA → PRESSURE → MATERIAL RESPONSE → REDESIGN.
PRESSURE describes how much force acts over a given area. In the idealised model, P = F ÷ A. If the same force is spread over a larger area, pressure decreases. If that force is concentrated onto a smaller area, pressure increases. Engineers use both effects: foundations and snowshoes spread loads; sharp edges and points concentrate force. The correct design depends on purpose, material strength, stability and safety. Use PURPOSE → FORCE → AREA → PRESSURE → MATERIAL RESPONSE → REDESIGN.
LEARNING BUILD
Learn it. See it. Try it.
Look at the example. Check another point of view. Then try the task.
Step 1: Choose a starting clueWHAT YOU ALREADY KNOW
English / communication:Technical explanation, quantitative justification and design evaluation.
Maths / data:Area, unit conversion, pressure calculations and proportional comparison.
Topic knowledge:Pressure as force per unit area, contact-area effects, material constraints and applied engineering design.
This week’s first target:Use pressure = force ÷ area to calculate pressure in pascals for idealised contact situations.
Which clue is a good place to start?
Choose a source that can directly support part of the investigation. More than one source may be useful, but start with evidence that does not outrun its support.
Need more help? See the teaching
TEACH 1 · CORE MODEL
PRESSURE describes how much force acts over a given area. In the idealised model, P = F ÷ A. If the same force is spread over a larger area, pressure decreases. If that force is concentrated onto a smaller area, pressure increases. Engineers use both effects: foundations and snowshoes spread loads; sharp edges and points concentrate force. The correct design depends on purpose, material strength, stability and safety. Use PURPOSE → FORCE → AREA → PRESSURE → MATERIAL RESPONSE → REDESIGN.
TEACH 2 · WHAT TO NOTICE
Use pressure = force ÷ area to calculate pressure in pascals for idealised contact situations.Explain why increasing contact area lowers pressure when force is held constant and why decreasing area raises it.
TEACH 3 · CONNECT + TRANSFER
Connect one pascal with one newton per square metre and use units correctly in calculations. Evaluate whether an engineering design should spread or concentrate force based on purpose rather than treating high or low pressure as universally better. Identify limitations of the simple pressure model, including uneven load distribution, deformation, material limits and local stress concentrations.
WORKED EXAMPLE · EVIDENCE
SMALL AREA
A 600 N force spread over 0.02 m² gives 30,000 Pa in the idealised model.
Reasoning: Start with exactly what the source establishes. Connect it to the relevant concept, then stop before the claim becomes broader than the evidence. Now compare it with DESIGN CONTEXT: Wide foundations, tracks and snowshoes can reduce pressure on a supporting surface. Cutting edges, needles and points may deliberately concentrate force over a small area.
Why caution still matters:This item is useful context, but context is not the same as direct proof. Combine it with stronger evidence before making a broad conclusion.
WORKED EXAMPLE · MATHS / DATA ROUTE
A 900 N force is spread evenly over 0.06 m². What is the idealised pressure?
This week’s maths/data focus:Area, unit conversion, pressure calculations and proportional comparison.
Name the variable or relationship, keep the units visible, calculate or compare, then interpret the result as evidence about the system. A result can support an explanation without proving every possible cause.
Worked solution:Pressure = force ÷ area. 900 N ÷ 0.06 m² = 15,000 N/m², which is 15,000 Pa.Answer check:15,000 Pa. Now return the result to the question and state what it means in context.
WE DO · GUIDED PRACTICE
Which source needs the most caution before it is used to support a broad conclusion?
Choose a source that mainly supplies context rather than direct proof of the whole conclusion.
YOU TRY · INDEPENDENT PRACTICE
For Pressure Lab, explain one core idea, connect it to one named source or observation and one quantitative/data point from this page, then state an alternative explanation, trade-off or limitation that a strong judgement must consider.
Write at least 30 words. Name the evidence or data you are using and keep the claim inside what it can support.
MISCONCEPTION CHECK
DESIGN CONTEXT:Wide foundations, tracks and snowshoes can reduce pressure on a supporting surface. Cutting edges, needles and points may deliberately concentrate force over a small area.
This item is useful context, but context is not the same as direct proof. Combine it with stronger evidence before making a broad conclusion.
HELP
Try: “If ___ changes, the mechanism predicts ___. Evidence ___ supports/challenges that. An alternative explanation is ___. I would test ___ next.”
STRETCH · OPTIONAL
Build the strongest reasonable counter-argument or alternative explanation. Name one additional piece of evidence that could distinguish between the two positions.
PRESSURE LAB · ENGINEERING BAY▦
PRESSURE LAB
Same force. Different area. Very different result.
Calculate pressure, compare contact areas, decide when engineers need to spread or concentrate force, and redesign a tool or structure under constraints.
CORE MODEL
Which relationship is used in this week’s idealised pressure calculations?
ENGINEERING CONTACT TEST
Keep the force the same. Change the contact area.
— Pa
The model uses P = F ÷ A with idealised, evenly distributed forces. Real materials, edges, deformation and uneven loading can create more complex pressure patterns.
Complete all three same-force area tests. Then compare the calculated pressure as contact area increases.
SPREAD OR CONCENTRATE?
DESIGN 1
A wider snowshoe spreads the same weight over a larger contact area.
DESIGN 2
A sharp blade concentrates a force along a very small contact area.
DESIGN 3
A building foundation is widened so the same load is carried over more ground area.
UNITS CHECK
One pascal (Pa) is equivalent to:
ENGINEERING TRADE-OFF
Why might “lowest possible pressure” be a poor universal design rule?
MODEL LIMIT
What does the simple pressure calculation leave out?
Pass the pressure formula check, complete three same-force area tests, classify all three design applications and finish the units, trade-off and model-limit checks.
OPEN THE WEEK 6 EVIDENCE FILES
SOURCE 1
SMALL AREA
A 600 N force spread over 0.02 m² gives 30,000 Pa in the idealised model.
SOURCE 2
MEDIUM AREA
The same 600 N force spread over 0.06 m² gives 10,000 Pa.
SOURCE 3
LARGE AREA
The same 600 N force spread over 0.12 m² gives 5,000 Pa. Holding force constant isolates the effect of area in this model.
SOURCE 4
DESIGN CONTEXT
Wide foundations, tracks and snowshoes can reduce pressure on a supporting surface. Cutting edges, needles and points may deliberately concentrate force over a small area.
SOURCE 5
MODEL LIMIT
The P = F ÷ A calculation assumes an idealised average pressure over a known contact area. Real materials can deform and loads can be uneven, creating local stresses the simple model does not show.
INVESTIGATE + ENGLISH · EVIDENCE CASE
Pressure turns geometry into a force-system decision
Two designs can carry the same force yet interact very differently with a surface. If the force is spread across a large contact area, the average pressure is lower. If the area becomes smaller while the force stays the same, the pressure rises. This is why engineers cannot simply ask whether high pressure or low pressure is “better”. A support foundation may need to spread load to avoid sinking or damaging a surface, while a blade may need to concentrate force to cut. The simple equation provides a useful first model, but real design also depends on material strength, deformation, stability, wear and how evenly the load is distributed.
MAKE THE CALL
A fictional rescue platform must carry the same load on soft ground without sinking excessively. Choose a contact area or redesign approach, calculate the resulting pressure, compare it with a smaller-area alternative, and identify one structural or material constraint that could change your final design.
BUILD YOUR CASE CONCLUSION1. Make the call. 2. Use at least two relevant pieces of evidence. 3. Explain one limitation or uncertainty. 4. Finish with what can responsibly be concluded.Strong structure: My judgement is… The strongest evidence is… However, we still do not know… Therefore…
CASE CONCLUSION: Write 220–300 words comparing the three same-force Pressure Lab tests. Show at least two P = F ÷ A calculations with units, explain the inverse relationship between area and pressure, apply the principle to one load-spreading and one force-concentrating design, and identify one limitation or trade-off the simple model does not capture.
0/220 words minimum for this writing mission.
CLAIMEVIDENCELIMITATIONCONCLUSION
MATHS + DATA LAB
Check the numbers.
HOW TO SUCCEEDRead the situation first. Estimate what a sensible answer should look like, choose an efficient calculation, then use the feedback to check your reasoning.For data questions, explain what the number shows — and what it does not prove.
A 900 N force is spread evenly over 0.06 m². What is the idealised pressure?
Estimate first, then choose the answer.
MISSION 05 · MATHS + DATA LAB
DATA TRAINING
STATISTICS + PROBABILITY · YEAR 8 EXTENSION
6 PROBLEMS
QUICK METHODSTATISTICS + PROBABILITY
Identify what the statistic or probability represents before calculating.
GUIDED · Q01–Q03Use the quick method, then check the explanation.
Q01
Mean of 4, 6, 8, 10?
Total 28 ÷ 4 values = 7.
Q02
Median of 3, 5, 7, 12, 20?
The middle value in order is 7.
Q03
A fair coin: probability of heads?
There are two equally likely outcomes, so heads has probability 1/2.
INDEPENDENT · Q04
A bag has 3 red and 7 blue counters. P(red)?
There are 10 counters total and 3 are red: 3/10.
INDEPENDENT · Q05
Range of 6, 9, 11, 15?
Range = maximum − minimum = 15 − 6 = 9.
INDEPENDENT · Q06
Which sample is most likely to represent the whole school?
A random sample across year levels reduces obvious selection bias.
OPTIONAL CHALLENGE · OPEN RESPONSE
Two groups report different means. Name two things you would check before deciding the groups are genuinely different.
0 words · optional
PROJECT HQ · TERM 3 · KEEP BUILDING
PROJECT HQ · PROJECT FILE 06
IMPROVE — revise from results.
Start something real. Build an idea, test it, improve it, and share it. Make your move.
IMPROVE your Resilient Systems Challenge from performance evidence. Make an evidence-led revision, explain the mechanism, identify the trade-off it introduces and define a stronger retest or comparison.
WEEK 6 · IMPROVE FROM EVIDENCE · Revise the system from measured performance. State the mechanism, trade-off and retest so the change can be defended rather than guessed.
Complete all five fields. Your Week 6 revision log is saved on this device.
Project sharing will be optional. A future upload system must keep private submission separate from public-showcase/marketing permission.
CHECK-IN
What changed in your thinking?
24MASTER MODE
YEAR 8 · REMIX · TERM 3 / WEEK 6
PRECISION ROLL
Use ten balls to chase accuracy streaks and the smallest scoring rings.
02LEARN
03INVESTIGATE
05DECIDE
07PROJECT
08CHECK-IN