Building Better Teaching Aids – Why I Keep Redesigning Everything

“Good teaching aids don’t just demonstrate science—they make students think.”

That simple idea sits behind an awful lot of what I do.

Over the years, I’ve accumulated a workshop full of:

• Sensors
• Cameras
• Electronics
• PASCO equipment
• 3D printers
• Laser cutters
• DIY experimental rigs

And yet, despite all the excellent commercial science equipment available today… I still keep redesigning things.

Not because the original equipment is bad.

But because teaching has changed.

Especially online.

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The Traditional Problem with Teaching Equipment

Many pieces of science apparatus were designed decades ago with one assumption:
The student is standing right next to it.

That worked reasonably well in a classroom where:

• Students crowded around a bench
• The teacher pointed at something small
• Everyone pretended they could see it properly

The reality?

Usually:

• The students at the front saw everything
• The students at the back saw almost nothing

And online learning magnifies that problem dramatically.

A tiny moving needle on a meter? Invisible.
A subtle colour change? Hard to spot.
A delicate oscillation experiment? Lost completely on camera.

So the question becomes:
How do you redesign science demonstrations for the modern world?

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Why Commercial Equipment Isn’t Always Enough

Commercial science equipment is often:

• Extremely accurate
• Well engineered
• Robust

But it is not always:

• Easy to film
• Easy to visualise
• Designed for remote learning

Many systems were never intended to be:

• Seen through a camera lens
• Viewed on a phone screen
• Streamed live online

That changes the design priorities completely.

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The Rise of the “Visual Experiment”

When teaching online, visibility becomes critical.

Students must be able to:

• Clearly see what is changing
• Understand where to look
• Follow the experiment step-by-step

This means experiments need to become:
Larger
Clearer
More visually obvious

Sometimes that involves:

• Bigger displays
• Better lighting
• Coloured indicators
• Digital overlays

And sometimes it means redesigning the experiment entirely.

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Using PASCO Equipment as the Starting Point

Systems from PASCO Scientific have become incredibly useful because they bridge the gap between:

• Practical experimentation
• Real-time data collection
• Visualisation

Instead of:
“Trust me, the graph should look like this…”

Students can see:

• Live graphs forming
• Sensor readings changing instantly
• Direct relationships between variables

That transforms understanding.

Especially in:

• Motion experiments
• Electricity
• Waves
• Gas laws
• Reaction rates

The experiment becomes interactive rather than observational.

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But Even Then… I Still Modify Things

Because once you start filming experiments regularly, you notice problems.

For example:

• A sensor blocks the camera angle
• Reflections make readings difficult to see
• Important movements are too small on screen
• Equipment occupies the wrong space for multi-camera filming

So gradually:
rigs evolve.

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DIY Builds – Solving the Problems Commercial Equipment Doesn’t

This is where the workshop becomes important.

Sometimes the solution is surprisingly simple:

• A different mounting bracket
• A larger scale model
• A redesigned support
• Better positioning for cameras

Other times it becomes a full DIY project.

For example:

• Building a low-cost linear air track
• Creating custom mounts for sensors
• Designing rigs specifically for filming experiments

The goal is not simply:
“Can the experiment work?”

But:

 “Can students understand it instantly?”

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Multi-Camera Teaching Changes Everything

One of the biggest changes in modern teaching is the ability to combine:

• Close-up views
• Wide shots
• Data screens
• Live annotation

All simultaneously.

Instead of students trying to look:

• At the teacher
• At the experiment
• At the graph

They can see all three at once.

That massively reduces cognitive overload.

It also allows:

• Slow demonstrations
• Instant replay
• Highlighting of critical moments

A tiny detail suddenly becomes obvious.

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Why Interactivity Matters

Students learn best when they:

• Predict outcomes
• Make decisions
• Observe results

Good teaching aids encourage this.

Bad teaching aids encourage passive watching.

That’s a huge difference.

So I increasingly design experiments where students can say:
“What happens if we change this?”

And then we actually test it live.

This transforms science from:
memorisation

into:
investigation.

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Improving Measurement Accuracy

Interestingly, redesigning experiments often improves accuracy too.

Because when you:

• Stabilise equipment better
• Reduce friction
• Improve alignment
• Use digital sensing

You reduce noise and uncertainty.

Students then see:

• Cleaner results
• Clearer trends
• Better relationships between variables

Which makes interpretation easier.

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Teaching Aids Should Support Thinking

This is the key point.

A teaching aid is not there to:
look impressive.

It is there to:
make the student think clearly.

The best demonstrations:

• simplify complexity
• focus attention
• reveal patterns

And that often means:
redesigning the original setup

The Unexpected Benefit – Students See Engineering Too

One thing I particularly enjoy is that students begin to see:

• problem solving
• prototyping
• iterative design

Not just science content.

They realise:
science equipment is designed by people
experiments can be improved
engineering and teaching overlap constantly

That’s a valuable lesson in itself.

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And This Is Why I Keep Redesigning Everything

Not because I dislike commercial equipment.

But because:

• teaching changes
• technology changes
• online learning changes expectations

And good teaching evolves alongside it.

Every redesign asks the same question:
“How can I make this clearer?”

Because when students can:

• see clearly
• interact directly
• understand visually

Science stops feeling abstract.

And starts making sense.