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Class 9 · Matter in Our Surroundings

Dissolving & Diffusion Sandbox

Drop a solute into water, then heat or stir it — watch how particles move and mix.

The Beaker

Tap a button below to add a solute, then heat or stir the water.

150 particles

Diffusing…

Heat Water

Average Kinetic Energy

18rel. units

Baseline

Diffusion Status

Not Mixed

Water particles

Potassium permanganate

Blue ink

Key Takeaway

Drop some potassium permanganate or ink into the beaker to begin the experiment.

Wisdawn Interactive Lab · Diffusion is the movement of particles from a region of higher concentration to lower concentration.

Force & Laws of Motion

Interactive Physics Lab · Wisdawn

Live Simulation

Law of Inertia

1st Law

Truck, box & inertia

F = m·a

2nd Law

Force, mass & acceleration

Action–Reaction

3rd Law

Astronaut throw

Speed 0 km/h

Phase Rest

Space Play R Reset ← → Speed

Vehicle Speed 55 km/h

Friction (box ↔ bed) 30%

Box Mass 12 kg

⏱ Motion Timeline

Rest

Accelerate

Constant

Braking

Box Slides

Stop

a = 0.00 m/s²

v = 0.00 m/s

Applied Force 40 N

Crate Mass 10 kg

∑F Newton's Second Law

F = m × a

40

Force (N)

10

Mass (kg)

4.00

Accel (m/s²)

📈 Live Graphs

Velocity–Time

Acceleration–Time

Distance–Time

Astronaut v 0.00 m/s

Box v 0.00 m/s

Throw Force 50 N

Object Mass 3 kg

⚖ Conservation of Momentum

m_astro × v_astro = m_box × v_box — the astronaut's mass (78 kg) is far greater than the box, so they drift backward far slower than the box flies forward.

Newton's First Law

An object at rest stays at rest, and an object in motion stays in motion at constant velocity, unless acted upon by an external force. This resistance to change is called inertia.

🔮 Predict the Outcome

What happens to the box when the truck brakes suddenly?

Box moves backward, away from the cab Box stays perfectly still Box keeps moving forward, toward the cab

👁 Live Observation

Press Play to begin the simulation and watch inertia in action.

Everyday Examples

Tap a card to learn more →

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Seatbelt

Stops your body's forward inertia during sudden braking.

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Bus Brakes

Standing passengers lurch forward when the bus stops fast.

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Book on Table

Stays still until you push it — inertia at rest.

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Coin & Card

Flick the card away and the coin drops straight down.

⚽

Football

Stays at rest on the ground until kicked with force.

🛒

Shopping Cart

Heavier, fully-loaded carts resist changes in speed more.

Wisdawn Interactive Lab · Class 9 Science · Force & Laws of Motion

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Seatbelt