Interactive Physics Lesson Ideas with Simulations

These interactive physics lesson ideas are ten ready-made activities that cover the main topics, from motion graphs to the photoelectric effect. Each idea gives you the simulation, a driving question, what students do in two to four steps and the result they should get, with numbers taken from the simulation itself. Physics suits simulations well: students can remove friction, slow time down, read forces they can't see and repeat a "lab" twenty times in a lesson. That lets you spend class time on the hard part, which is explaining what happened. All the simulations are free on Simulic, and students open them from a link or QR code without an account.

For the general routines (projector demos, self-paced links, homework), start with how to use interactive simulations in the classroom. This guide goes deeper on physics content.

Mechanics: motion, forces and momentum

1. When does the fast car catch the slow one?

Grades 6–8 · Two moving cars – distance–time graph

Driving question: Car A drives at 8 m/s. Car B drives at 4 m/s but starts 20 m ahead. When and where does A catch B?

1. Students sketch both lines on paper and mark where they think they cross.
2. Press Run with the defaults and switch on "Show Δs/Δt slope triangle" to read each speed from the graph.
3. Set "Speed of car B" to 0 and run again.

Expected result: the lines cross at t = 5 s, 40 m from A's start (t = 20/(8 − 4)). With car B stopped, its line is flat and A reaches it at 2.5 s. Then ask: what speed of B means the lines never cross? (Any speed of 8 m/s or more.)

2. Does doubling the mass halve the acceleration?

Grades 9–10 · Newton's second law – pulling a block

Driving question: If we double the mass of the block but pull with the same force, what happens to the acceleration?

1. Run the defaults: F = 10 N, m = 2 kg, μ = 0.2, level surface. Record a from the readout.
2. Predict, then set the mass to 4 kg and press Reset.
3. Repeat both runs with μ = 0.

Expected result: with friction, a drops from 3.04 m/s² to 0.54 m/s², far less than half, because friction (μN) doubles too and eats most of the 10 N. Without friction, a goes from 5.0 to 2.5 m/s², exactly half. Extension: set the incline to 30° and find the smallest whole-number force that moves the block up the slope. At 13 N it stays still (static friction); at 14 N it moves with a = 0.40 m/s².

3. Where does the momentum go in a crash?

Grades 9–11 · Air track collisions

Driving question: Two carts collide. Is anything the same before and after?

1. Use the defaults: m₁ = 1 kg at 3 m/s, m₂ = 2 kg at −1 m/s, elastic. Run and copy the Before and After rows of the table.
2. Press "Change collision type" for the sticking (inelastic) case and run again.
3. Compare total momentum and kinetic energy in both cases.

Expected result: total momentum is 1 kg·m/s every time. In the elastic collision the carts leave at about −2.33 m/s and 1.67 m/s and kinetic energy stays at 5.5 J. When they stick, they move together at 0.33 m/s and only about 0.17 J of kinetic energy remains: 5.33 J became heat and deformation.

Energy and thermal physics

4. Does a heavier skater go faster at the bottom?

Grades 7–10 · Skate park – conservation of mechanical energy

Driving question: Two skaters drop from the same height. One has a mass of 25 kg, the other 100 kg. Who is faster at the bottom?

1. On the Intro screen with the Ramp, drop the skater from the 8 m rim and read the speed at the bottom.
2. Change "Skater mass" and repeat.
3. Switch to the Friction screen, raise μ and watch the thermal energy bar.

Expected result: both reach about 12.5 m/s, because v = √(2gh) doesn't depend on mass. The heavier skater has four times the energy, not more speed. For grades 11–12, use the Loop track: theory says the release point must be at least 2.5 × the loop radius (2.2 m) above the bottom, about 5.5 m, or the skater leaves the track.

5. Why does the water barely warm up?

Grades 8–10 · Thermal equilibrium – hot object in water

Driving question: A 0.5 kg block of aluminum at 100 °C goes into 1 kg of water at 20 °C. What is the final temperature?

1. Students write a prediction. Many say about 60 °C, "halfway".
2. Run the defaults and read the equilibrium temperature.
3. Swap the material to copper, then to water, with the same masses.

Expected result: only about 27.6 °C. Water needs 4,200 J to warm 1 kg by 1 °C, aluminum only 880 J, so the water "wins". Copper gives 23.5 °C. Hot water at 100 °C gives 46.7 °C. Follow up with the specific heat capacity simulation: with 500 W for 60 s, 1 kg of water rises about 7 °C while 1 kg of aluminum rises about 34 °C.

Waves and light

6. Which frequencies make a standing wave?

Grades 10–12 · Standing waves on a string

Driving question: Why does the string only "lock" into a pattern at certain frequencies?

1. Start at the defaults (1.2 m string, wave speed 24 m/s, 20 Hz) and count nodes and antinodes.
2. Nudge the frequency to 22 Hz and watch the pattern travel. Press "Snap f to nearest harmonic".
3. Students predict the lowest standing-wave frequency, then test it. Finally tick "Right end free".

Expected result: 20 Hz gives λ = 1.2 m, two antinodes and three nodes. The fundamental is v/2L = 10 Hz, and the harmonics are 10, 20, 30, 40 Hz… With one free end only odd quarter-wave patterns fit: 5, 15, 25 Hz.

7. Find the refractive index of a mystery material

Grades 9–11 · Light rays – refraction and total internal reflection

Driving question: How can you identify a transparent material you have never seen?

1. On the Intro screen, shine the laser from air into water at 45° and read the angle of refraction with the protractor.
2. Choose Mystery A as the bottom medium. Measure i and r for three angles and calculate n = sin i / sin r.
3. Press "Check mystery". Then put glass on top and air below and find the angle where the refracted ray disappears.

Expected result: air to water at 45° gives r ≈ 32°. Mystery A has n = 1.20 (r ≈ 36° at 45°), Mystery B has n = 1.60. Glass to air has a critical angle of about 41.8°; water to air about 48.8°. This is a good place for a number question with a tolerance of ± 0.05.

Electricity

8. Series or parallel: which bulbs glow brighter?

Grades 8–10 · DC circuit construction kit

Driving question: Two identical bulbs, one battery. Are they brighter in series or in parallel?

1. Open the "Two bulbs in series" starting circuit, then "Two bulbs in parallel". Students rank the brightness first.
2. Use the voltmeter to measure the voltage across each bulb in both circuits.
3. On the Lab screen, build a 9 V battery with 10 Ω and 20 Ω resistors in series and measure.

Expected result: parallel bulbs are brighter, because each one gets the full battery voltage. In the resistor circuit the ammeter reads 0.30 A and the voltmeter reads 3 V and 6 V, which add to exactly 9 V. For a full lesson on V = IR, see the Ohm's law lesson plan.

Modern physics

9. Why can't bright red light free an electron?

Grades 11–12 · Photoelectric effect

Driving question: Will brighter light always eject electrons from a metal?

1. Choose sodium (A = 2.28 eV). Set the wavelength to 700 nm and the intensity to 100%.
2. Lower the wavelength in 10 nm steps until electrons appear.
3. At 400 nm, change only the intensity, then try zinc.

Expected result: at 700 nm nothing happens at any intensity, because each photon carries only 1.77 eV. Electrons first appear at 540 nm (threshold λ₀ ≈ 544 nm). At 400 nm, photons carry 3.10 eV and Ek(max) = 0.82 eV. Brighter light gives more electrons, not faster ones. Zinc needs light below about 289 nm.

10. Can you predict which nucleus decays next?

Grades 9–12 · Radioactive decay and half-life

Driving question: If decay is random, how can a half-life be exact?

1. Run N₀ = 200 with a half-life of 4 s and read N at 4, 8 and 12 s.
2. Repeat with N₀ = 50, then with 400.

Expected result: theory says 100, 50 and 25 nuclei remain. Students see that no one can say which nucleus goes next, yet the sample halves every 4 s. With 50 nuclei the count wanders visibly off the curve; with 400 it hugs it.

Which misconception does each idea target?

Pick ideas by the wrong idea you hear most in your class, not only by topic. This table also suggests a question to attach to the link.

Idea	Common wrong idea	Question to attach
1. Two cars	"The lines cross where the cars have the same speed."	Number: meeting time (5 s ± 0.1)
2. Newton's second law	"Twice the mass always means half the acceleration."	Number: a with m = 4 kg (0.54 m/s² ± 0.02)
3. Collisions	"Energy and momentum are the same thing."	Multiple choice: which quantity is conserved when the carts stick?
4. Skate park	"Heavier objects go faster downhill."	Prediction: who is faster at the bottom?
5. Thermal equilibrium	"The final temperature is halfway."	Number: 27.6 °C ± 0.5
6. Standing waves	"Any frequency gives a standing wave."	Number: lowest frequency (10 Hz ± 0.5)
7. Refraction	"Light always bends toward the normal."	Number: critical angle (41.8° ± 0.5)
8. Circuits	"Bulbs in parallel share the voltage."	Short text: why are parallel bulbs brighter?
9. Photoelectric effect	"Brighter light gives faster electrons."	Prediction: what happens at 700 nm and 100% intensity?
10. Radioactive decay	"After two half-lives, nothing is left."	Number: theoretical count left after 12 s (25 ± 1)

Prediction questions lock the simulation until the student commits, so they suit ideas 4 and 9, where the first guess matters most.

How to run these in class

Each idea fits one of three formats.

• Whole-class prediction. Ideas 2, 4 and 5 produce strong wrong predictions. Collect a vote, then run the simulation on the projector in present mode (add ?present=1 to your link). The Predict–Observe–Explain guide gives the full routine, and teaching with a projector covers present mode and the QR code that moves students onto their own devices.
• Pair work with a target. Ideas 1, 6, 7 and 9 have a number to find. Create a link per class on the Share page and pin the starting values, so every pair starts from the same setup.
• Quick check. Attach a question set to the link. A number question checked with a tolerance works well here: "What is the critical angle from glass to air?" (41.8°, ± 0.5°). See using simulations for formative assessment for how to act on the answers.

Keep each activity to 15–25 minutes, and finish with one written "why" sentence. If an idea needs a different setup than the library offers, you can press Customize on the simulation page and edit your own copy with AI. Check the values before class, because AI output can contain mistakes.

FAQ

Which idea works best for a first simulation lesson?

The skate park (idea 4) or the two cars (idea 1). Both need almost no instructions, and the prediction splits most classes.

Can I use these physics simulations without a device for every student?

Yes. Run them on the projector in present mode and collect predictions by show of hands or on mini whiteboards. Pairs sharing one phone also work for every idea here.

How long does each idea take?

Most take 15–20 minutes, including the prediction and a short discussion. Ideas 7 and 8 can fill a full lesson if students collect a data table.

How do I stop students from just copying the expected values?

Pin different starting values on each class link, for example a different string length in idea 6 or a different car speed in idea 1. The method stays the same, but the answer changes.

Are the numbers in the simulations realistic?

They come from the standard equations, with g = 9.8 m/s² and textbook constants. They are models, so they leave things out, such as air resistance in idea 4 or heat lost to the calorimeter in idea 5. Ask students what each model ignores.